Abstract: An apparatus for automatically stacking a fuel cell stack includes a component pick-up unit configured to simultaneously pick up one separating plate component accommodated in a first magazine and one membrane-electrode assembly (MEA) sheet component accommodated in a second magazine, and load the components onto a start end of a component transfer route of a conveyor; a component examining unit installed at an upper side of the component transfer route of the conveyor, a defective component extracting unit installed at a rear side of the component examining unit, a component stacking unit installed at a distal end of the component transfer route of the conveyor, and a component pressurizing unit installed at an upper side of a transfer route of the stack guide.

Abstract: The framing layout assembly includes a housing that is positionable proximate the member. A tape is operationally coupled to the housing. The tape may be extendable from the housing. The tape has indicia printed thereon. The indicia indicates distance. The tape has a tape hole extending therethrough. A guide is operationally coupled to the housing. The tape extends through the guide. A stop is operationally coupled to the housing. The stop is extendable through the hole in the tape. The tape is retained at a pre-determined distance. A jig is operationally coupled to the housing. The jig is positionable on the member. A user marks the member at the pre-determined distance.

Abstract: A straight edge clamping device includes front and rear sections and first and second connection locks. The connection lock is configured to be fit into the connecting ends of the elongated hollow portions of the front and rear sections. The first and second connection locks fit into the connecting ends of the first and second elongated hollow portions of the front and rear sections so as to connect and lock the front section with the rear section securely. Each of the first and second connection locks comprises: an outer surface fitting substantially tightly to at least a part of inner surface of the elongated hollow portion and an inner groove recessed inward from the outer surface, so as to provide rigidity against bending, shearing, or straining force on the straight edge clamping device.

Abstract: An apparatus comprises a planar member comprising a top side, a bottom side comprising a flat surface and at least one aperture comprising a defined shape. At least one alignment tab comprises a top portion, a middle portion and a bottom portion. The middle portion comprises the defined shape and is configured to move vertically within the aperture. The top portion comprises a hook structure being configured to engage the top side to limit a downward movement of the alignment tab. The bottom portion comprises a vertical facing side being configured to engage an edge of a flat material. The apparatus is operable to align the flat material relative to the planar member by engaging the edge of the flat material with the vertical facing side and a vertical movement of the alignment tab enables the planar member to rest flat on the first flat material.

Abstract: The tool is formed of an elongate rigid bar having a pair of straight side edges extending between opposite ends. Indicia are provided adjacent graduations correlating with distances away from center holes located at each end of the bar. A series of marking holes are provided at various distances away from the center holes. Thus, when a pin is provided through one center hole, a marking tool can be placed within a marking hole having a distance corresponding with a radius of a curve to be formed, and the bar can be rotated about the pin in the center hole while the marker is allowed to form a mark in an underlying workpiece. The straight edges of the tool can also be utilized for forming straight edges.

Abstract: The present invention relates to a straight edge device for use in conjunction with power tools such as radial saws, or table saws. The present invention is used for cutting an uneven edge of a board. The straight edge device includes a one piece board having a protuberance projecting from its lower surface that engages a groove of the table saw. The board is placed on the upper surface of the one piece board with the uneven edge hanging over the edges of the one piece board. As the straight edge device is pushed or pulled through the groove of the table saw, the cutting blade straights the uneven edge of the board.

Abstract: A device for determining the category of mail of a mailpiece, which device comprises: an stand designed to receive said mailpiece; at least one gauge fastened to said stand and provided with a slot of predetermined length and of predetermined height, which length and which height are suitable for defining a determined maximum width and a determined maximum thickness for the mailpiece; means for automatically estimating a length of the mailpiece depending on its position on the stand, and relative to the gauge; and means for acting, on the basis of that single estimate of the length of the mailpiece, to deliver, to a franking machine, information about the category of mail to which said mailpiece belongs.

Abstract: Apparatus is disclosed for anchoring a kayak to the bottom of a body of shallow water. The apparatus includes first and second tubes for attachment to the kayak proximate the upper portion of the kayak between the bow and the stem of the kayak, and first and second shafts which are disposed in the first and second tubes, respectively. A gear box is provided proximate the seat which comprises two sets of gearing mechanisms for operative engagement with the two shafts, and a rotatable handle which is external to the gear box for operative connection to the first and second gearing mechanisms.

Abstract: A method of producing a fuel cell by layering a large number of sheets of unit fuel cells (11). A first supporting plate (14) is placed at the front section of a pusher unit (52) in a slightly inclined, upward facing position, and then a large number of sheets of unit fuel cells are layered on the first supporting plate (14). After that, while making the pusher unit fall into a horizontal position, vibration is applied to the layered unit fuel cells for alignment. A second supporting plate (15) is provided at the front end surface of the aligned unit fuel cells. The first and second supporting plates are connected using connection plates (16, 16) while a predetermined pressing force is applied to the unit fuel cells through the first supporting plate and the second supporting plate.

Abstract: To provide a parallel ruler device with which it is easy to obtain a plate material of a constant width having parallel sides. Also, to make it possible to easily carry out a precision adjustment of an amount of parallel movement of a ruler face by means of a visual observation. Also, to enable a precision adjustment of a desired dimension in both a positive direction and a negative direction with a position fixed once as a base point.

Abstract: An extrusion cross-section for a straight edge clamping device including (a) an elongated hollow base having a constant cross-section; (b) a first stop fixed at one end of the base; (c) a second stop movably provided along the base; and (d) a clamp for holding the workpieces together, includes a) a flat base portion having top and bottom surfaces, and two edges; b) two L-cross-sectioned portions having horizontal and vertical parts, facing each other, integrated with the flat base on the top surface of the flat base forming a top groove; c) two hollow portions, facing each other, integrated with the flat base on the bottom surface of the flat base forming a bottom groove; and d) two flanges having a horizontal part, vertical parts, facing each other, integrally connected to the corresponding hollow portion, wherein the cross-section has a right-left symmetry with a vertical center line as symmetry axis.

Abstract: A picture hanging position marking tool is disclosed having a relatively flat, elongated support arm is a marking orifice at the distal end opposite a support arm handle. The marking orifice is bounded at its lower edge by a support cam, pivotally affixed to one side of the support arm. The support cam is comprised at its upper edge of a first hanger support ridge formed parallel to a second hanger support ridge. The two hanger support ridges bound a marking cavity between. Measuring indicia are provided along the length of the support arm, and a bubble level is located horizontally within the handle.

Abstract: A guide tool for performing a work function step such as cutting or drawing a line along a workpiece including a guide plate having planar opposite sides, a longitudinal slot, a first straight guide edge substantially parallel with the slot, guide flanges along opposite sides of the slot defining a guide channel on a first side of the guide plate, and two clamps adapted for assembly with guide plate, the clamps having a first jaw including a guide member slidable along the guide plate channel and a second jaw extendable through the guide plate slot and a pressure plate for securing the clamps to a workpiece along opposite sides of the workpiece, and clamp handles formed integral with the jaws and spring biased apart to urge the jaws together for clamping the guide plate to the workpiece, and the clamp handles being positioned in spaced relation from the first side of the guide plate for ready access by a user from the first side of the guide plate when the clamps are assembled with the guide plate and the gui

Abstract: A router table sled for use with a router table and a router table fence includes an arm assembly that rides along the fence and a strut assembly that supports the workpiece. The arm assembly includes a slider that slides along an upper edge of the fence and an arm attached to an upper edge of the slide. The arm is usually in a position perpendicular to the slide. The arm is also coupled to a strut assembly that includes a main strut, and two additional struts located beneath the main strut. Each strut includes a longitudinally-centered T-shaped slot formed into top, front, and rear faces. The front faces of each strut lie substantially within the same plane. The two lower struts have opposing edges that are spaced a predetermined distance from each other. When a workpiece is clamped to the faces of the struts, an edge may be placed against the fence. The workpiece may then be moved across the router bit to produce a square cut.

Abstract: A device for connecting the arms 4 of an angle, in particular a construction angle, comprises a corner piece 1 with two rails 5 which are at right angle to each other and to which the arms 4 which are formed by straight battens are connected by clamping bands 6.

Abstract: The invention relates to a method for measuring at least one step of a stair, wherein the riser and tread of the or each separate step are determined, characterized in that at least two steps of the stair are provided, in a corresponding manner, with a reference point, whereupon a pin is positioned in each reference point, which two pins cross in a junction in such a manner that of each pin the length between the reference point and the junction is known, whereupon in the plane defined by the pins the angle is recorded that each of the pins includes with a reference line, which reference line includes a known angle, lying in the plane, with the vertical, and to an assembly for carrying out such a method.

Abstract: A router guide comprising a channeled track with a fixed fence attached at a top surface of a first end and a moveable fence slideably attached between the first end and the second end. The track affixes to one side of the workpiece and a router attached to a circular disk is manually slid between the fences to cut slots in the workpiece. The fences are rotatable to a plurality of angles to the track. A pair of router stops may be attached to the fences to limit the sliding motion of the router.

Abstract: A jig which receives a sheet in a selected position to accurately scribe it in a straight line. The jig has front and rear panels which form a vertical slit between them in which the sheet is received. The bottom of the sheet sits on an elongated support bar which extends horizontally in the slit and the line is scribed by running a scribing tool along the upper scribing edge of the front panel. The support bar has a pair of spaced studs which extend out through matching openings in the front panel to allow the support bar to be manually moved between a number of different vertical positions to select the distance the line is scribed from the bottom of the sheet. The openings in the front panel each have a number of spaced slots extending sideways which provide a pair of notches in which the studs are seated in each position. The studs are threaded to receive a retaining knob which are tightened against the front panel to secure the support bar in the selected position.

Abstract: A drafting board includes a base, a shoulder formed in the perimeter of the upper surface of the base, a magnetic board engaged in the shoulder of the base, two holes formed in the bottom surface of the base, and a rod engaged in each of the holes of the base for elevating the upper edge of the base. The upper edge is located higher than the lower edge and the base is supported by the rods in a sloped fashion.

Abstract: A mitering guide device for a circular saw has a protractor including a curved edge with angle markings thereon. An arm is pivotally attached to the protractor and performs in conjunction with a saw guide for defining an angle to be cut. A hinge is attached to the protractor and saw guide through multiple hinge joints for permitting various thicknesses of boards to be cut.

Abstract: A protractor including a base having a curved surface formed in an upper portion, a disc including a circular outer peripheral surface for slidable engagement with the curved surface of the base, the disc including an opening, a pair of flanges formed in parallel in the opening, and a slide including two end portions slidably engaged with the flanges of the disc so that the slide can be guided to slide along the flanges, whereby various geometric figures can be drawn by the protractor when the disc rotates relative to the base and when the slide slides along the flanges.

Abstract: A device to accurately define the angle relationship between a peripheral grinding wheel and it's tool rest in the vertical plane. The device uses the wheel periphery and tool rest surface to control the angle between the two. It is an 400 accessory to existing grinders. It is a separate device from the grinder enabling it to be used on several machines. It is not required structure for the grinding operation.

Abstract: A cutting guide assembly consists of a pair of guide rails in end-to-end abutting relationship with a clamping plate frictionally engaging each guide rail to secure the rails together. Each guide rail has a cross section defining a channel. A ramped or inclined lip is disposed within the channel, and is engaged by the end of a flange provided on the clamping plate to force the flange toward an inwardly facing stop surface defined by a wall of the guide rails. A series of set screws provide relative downward movement of the clamping plate, to cause the end of the flange to ride on the inclined surface and to force an outwardly facing surface of the flange against the stop surfaces of the guide rails. In this manner, the vertical guide surfaces of the guide rails are automatically aligned with each other when the rails are secured together. The clamping plate includes a second flange, which engages a supporting surface formed on a second inwardly extending lip.

Abstract: A table saw gauge includes a body positionable on the table top of a table saw and having a first scale for determining the saw blade height, a second scale for determining the saw blade angle, and a third scale for determining the distance from the saw blade to an adjacent fence. A blade is pivotally supported on the body and includes a first armature for engaging the uppermost tooth of the saw blade to determine saw blade height and second armature engageable with the side of the saw blade to determine saw blade angle. Pointers mounted on the body will aid cooperation with the first and second scales mounted on the body to indicate the height of the saw blade and the angle of the saw blade, respectively.

Abstract: A protractor comprising a generally flat protractor disc having a straight edge portion and a semi-circular portion. An arm member is pivotally secured at one end to a central section of the straight edge portion and overlies the front surface of the semi-circular portion at the other end. The arm member has a straight drawing edge that aligns with angle indicia on the semi-circular portion. An arcuate member extends outwardly from the front surface of the semi-circular portion. The arm member has recess in a rear surface thereof that receives the arcuate member therein. The relationship between the depth of the recess and the distance that the arcuate member extends from the front surface of the semi-circular portion is such that the arm member is spaced from the indicia on the front surface.

Abstract: Drawing apparatus for the preparation of technical drawings has a support for a drawing board on which paper may be attached. The support defines a frame surrounding the board which frame includes an upstanding lip for engagement by drawing instruments. Front, rear and side walls depend downwardly from the frame, and flare outwardly somewhat so that a series of apparatuses may be stacked for storage, with one nested partially within another. The lower edge of each side wall defines shoulders arranged so that the drawing surface may be disposed at one of three different angles to the horizontal when placed on a support surface, with that surface engaging different parts of the side walls. The frame may include an open-topped recess for holding drawing instruments, which recess will be closed by the next apparatus up, in a stack of such apparatus.

Abstract: A combined vernier gauge and protractor includes a primary rule having thereon a regular scale, a secondary piece slidable on the primary rule, and a protractor having a straight side pivotally mounted on and alongside the secondary piece. Such a device is provided in order that it can both provide the functions of a vernier gauge and a protractor. The secondary piece includes a vernier scale capable of cooperating with the regular scale to enable the present device to have a more accurate measurement.

Abstract: A guide for guiding wallpaper knife includes a planar member with a right-angled lip formed at a forward end portion of the planar member. The right-angled lip and the planar member form a press for pushing an overlapping sheet of wallpaper into a corner, while a flat linear edge of the right-angled lip provides a guide surface for guiding the wallpaper knife along a linear path substantially parallel to the corner of a room.

Abstract: There is disclosed a guiding device for use with a computer mouse, the device comprising a body, a friction strip provided on an edge member of the body for securing the mouse to the body while allowing the mouse to operate on a working surface, a bearing fixed to the body, a roller including a horizontal shaft having a longitudinal axis and two ends, the shaft being rotatable in the bearing, the bearing being axially translatable on the shaft, the roller further including working surface engaging wheels fixed to each end of the two ends, the roller substantially supporting the body, and a sight connected to the body for guiding the device to trace an image on the working surface, the device being able to be moved on the working surface in a direction of the axis by a translation of the bearing on the shaft and in a direction perpendicular to the axis by a rolling of the wheels on the working surface.

Abstract: Drawing boards and drawing instruments for use therewith. The surface of the board (1) has a set of parallel-running, evenly spaced magnetic poles (2) across it. Each drawing instrument has a cylinder (10) with similar parallel magnetic poles running essentially axially along it. The cylinder is freely rotatably mounted (12) and preferably held a little bit away from the board surface. The cylinder (10) preferentially orientates with its magnetic poles aligned with those (2) on the board surface. This orientation can be accurately maintained across the entire surface of the board without the use of cumbersome mechanical arrangements to ensure alignment of drawing instruments. When not required for use, the drawing instrument may simply be removed from the surface of the board. A ruler/protractor device (3) and a carriage bearing a pair of rules set at right angles are described.

Abstract: This invention pertains to a novel double cut edger which is useful for facilitating the cutting of edges of double lapped wall coverings and the like. An apparatus useful for assisting in cutter edging overlapping sections of adjacent surface coverings comprising an elongated body portion with at least one straight side, and at least one slot parallel with the straight side of the elongated body portion and penetrating through and extending substantially the length of the body portion.

Abstract: In connection with building stud layout, a continuous rollable tape, selectively and adhesively secured to the bottom and top plates of a wall installation, for positively establishing stud locations by providing a series of indicia portions, where like indicia portions represent the same on center stud distance, as, for example, 16", 24" and/or 48". Provision is made for accommodating the use of siding or sheeting of various thicknesses and still maintaining the stud centering at the desired distance. No measurement is required nor is guesswork involved by the stud installer.

Abstract: A fixture for holding workpieces at predetermined angles while they are being interconnected includes a pair of legs and a hypotenuse forming a right triangle, whose three vertices are truncated to enable the fixture to function as a jig, as a template, or as a bending tool. Workpieces may easily be attached to the fixture, obviating the need for special clamps.

Abstract: A student's multi-function protractor for conveniently drawing different geometric figures including a transparent middle plate which fits on the retainment space between an upper base and a lower base. The middle plate is rotatable in the retainment space. The circumferential edge with the middle plate of the upper base has a 360 degree scale. In addition, the middle plate has a plurality of parallel grooves which are scattered on one side from the central point for providing direct drawings. By accompanied with the grooves, scales and the indication elements on the middle plate, the protractor of this invention is used to easily draw different geometric figures.

Abstract: An improved adjustable protractor including a flat base member in pivoted connection with a pivoting member. The base member is calibrated with degrees indicia. The pivoting member includes an indicia indicator to detect designated degree indicia. Clamp is provided to clamp members together at a selected position.

Abstract: A drawing instrument incorporates two substantially planar members each formed with a straight guide edge and a mechanism connecting the members to permit them to rotate relatively to one another in parallel planes about an axis located in the vicinity of one end of each guide edge from one extreme position in which the guide edges lie together to another extreme position in which the guide edges are collinear. The mechanism connecting the members comprises a curved connecting piece in permanent sliding and interlocking engagement with curved channels in said two members the arrangement providing that there is no obstruction between the guide edges along their entire length irrespective of their immediate relative angular positions. The drawing instrument may include frictional damping mechanism comprising resilient tabs presented by the slide member and arranged to bear frictionally against respective planar members.

Abstract: A drawing aid for assisting in the marking of lines or other markings on sheet material incorporates a blade-like portion (2) which is connected with a location region (1A, 2A) which includes means (4, 5) deformable relative to the blade-like portion to be able to provide abutment surfaces which enable the aid to so co-operate with the actual edge of a sheet (8) of flexible or non-rigid material such as a sheet of paper as to use the edge (11) as the guide for the aid during the positional adjustment thereof to the location at which it is desired to draw lines or the like on the sheet (8). When the aid is engaged with a sheet edge (11) a part (1A, 2A) of the aid (1) presses on the sheet marginal edge (11A) to remove any buckles etc. and also to prevent any relative displacement of aid and sheet.

Abstract: The disclosed guide has an elongated planar body and a planar cross bar, angled normal to the body off one end edge thereof, somewhat in the configuration of a "T". One end of the cross bar projects away from the elongated body only a short distance, 1/4 to 5/8 of an inch; while the other end of the cross bar projects 11/8 to 11/4 of an inch away from the elongated body, corresponding to the width of the narrow side of a standard "metal stud" framing member. With the elongated body positioned against the wide side of the stud and the extended cross bar end squared against one narrow side of the stud, someone can consecutively mark both stud sides with this single guide setting; requiring the guide to be repositioned only once to mark the remaining narrow stud side.

Abstract: A precision rule having a handle part, preferably of aluminum, a holding part, preferably of a hardened steel and a rail embedded in a longitudinal groove of the holding part having a measuring edge, preferably of a hard metal. The handle part and the holding part are connected to one another by the interpositioning of O-rings and screws such that a space which forms a temperature barrier is created. The screw shanks extend loosely in the handle part. With this form of precision rule, any heat influence on the measuring edge through unavoidable external heat sources, for example the heat of hands, is avoided even during longer working times, and is achieved by the provision of built-in heat barriers.

Abstract: A vernier gauge includes a first arc member having a first radially inner side and a first radially outer side, a second arc member having a second radially inner side and a second radially outer side slidably engaged with the first radially inner side, having a second free end and a second clamped end and provided with a second scale, a third arc member having a third radially inner side slidably engaged with the first outer side and a third radially outer side, having a third free end and a third clamped end and provided with a third scale, the third arc member together with the first and second arc members defining a free space at the center of the first, second and third arc members, two intermediates each of which has a first end provided on one of the second and third free ends and a second end and is capable of moving radially with respect to the arc members and two measuring pieces each of which has a first engaging end pivotally connected to the second end and a second engaging end pivotally intercon

Abstract: A tool guide for directing hand tools over a workpiece at an angle perpendicular to one edge of the workpiece is disclosed. The guide has two perpendicular legs equipped with flanges for aligning the guide and directing a hand tool along the guide. Measuring units are provided along surfaces of the guide to allow it to be used alternately as a carpenter's square and to facilitate carpentry operations without premeasuring. The flanges are shorter than the legs to provide cutouts for clamp removal and a cross brace enables the guide to be optionally stabilized without clamps.

Abstract: A holding fixture used to mark pieces of sheet material that includes a base and a pair of upraised support towers mounted upon the base. The towers each contain vertical slots for receiving a worksheet therein so that the sheet is supported in a vertical posture. Straight edges are slidably mounted in each of the towers on each side of the worksheet that are used to guide a marking tool so that straight horizontal lines can be made on either surface of the sheet. A scale is provided for adjusting the position of each straight edge.

Abstract: A vernier gauge has three arc members, two flat pieces and two sliding pieces. A second arc member is slidably engaging with a first arc side of a first arc member from a first end of the first arc member and a third arc member is slidably engaging with a second arc side of the first arc member from a second end of the first arc member. Each of two free ends of the second and third arc members is actively attached one of the two flat pieces each of which is slidably engaged with one of the two sliding pieces. The second, third arc members and the two flat pieces are provided with main scales and the first arc member and the two sliding pieces are provided with corresponding vernier scales. Each of the two sliding pieces is further provided with two opposite tips and a flat surface. Such gauge can permit accurately fractional readings of angles as well as inner or outer diameters of objects and of depths of objects when the flat piece is solely used.

Abstract: Two rails, each having a straight edge, two ends and a cross section defining a channel, are placed in an end-to-end butting relationship to form a continuous straight edge. A joiner plate has an arcuate cross section and has lateral margins for being received in the rail channels. The plate is placed in the rail channels and is fastened to the rails so as to deflect the plate downwardly and force the lateral margins of the plate tight against the rails to align the rails and hold the rails together.

Abstract: A drafting tool functioning as a variable angle straight edge comprises an elongated rectangular main body portion made of transparent material. The lower edge of this main body portion has a first straight edge extending a major portion of the length of the main body portion from one end toward the other end to terminate at a point between the two ends. This edge is spaced a first distance from the top edge of the tool. A second straight edge parallel to the top edge and the first straight edge extends from the other end of the tool toward the termination point and is spaced a greater distance from the top edge than is the spacing between the top edge and the first straight edge. The two edges are interconnected by an offset forming a notch to receive the point of a drafting instrument at the junction of the offset and the first straight edge.

Abstract: A two-part navigational measurement device comprising a transparent circular disc having a coordinate grid thereon. An annular ring is coaxially positioned about the circular disc, the circular disc being rotatable within the annular ring. The annular ring has gradations around at least half of its circumference. A tangent ruler is fixed to the annular ring, the tangent ruler having a tangent edge which is tangent to the annular ring at the mid-point of the gradations. Means, such as a set screw may be provided for locking the disc and the annular ring against rotation relative to each other after the course to be adhered to has been determined.

Abstract: A handle for a drafting instrument and the like comprising a ring body structure having a traverse slot therethrough for permitting the ring to be compressed, and further provided with a groove or ridge structure for complementary engagement with the perimeter of a hole and double aperture of a drafting instrument with which the handle is used. The preferred embodiment has one ridge which is closest to the gripping surface of a handle of larger diameter than a contact ridge furthermost from the gripping surface for permitting easy indexing of the handle during installation with the drafting instrument. Another embodiment reverses the respective diameters of the two ridges, while a further embodiment employs an internal spring for increasing the outward tension of the ring when released, and a further embodiment wherein tongue and groove structure is complementarily provided between the drafting instrument and the engaging portion of the handle ring.

Abstract: Surface irregularities on a member (12), such as a main bearing or rod journal of a crankshaft (13), are determined by engaging a template edge (15,28) of a surface gauge (10,24) on the surface. A first side of the gauge (10,24) is subjected to light (19) to enable a worker to detect any light emitted between the surface (11) and template edge (15,28) which will indicate irregularities in the surface (11). The surface (11) is then machined to remove such irregularities. A plurality of such surface gauges (10,10',24) having template edges (15,15',28) of varied lengths, may be provided to the worker in kit form to facilitate the gauging of substantially all journal surfaces (11,22) in an engine, for example. Expeditious gauging of various journal surfaces (11,22) may thus be accomplished with a high degree of quality control.

Abstract: In a preferred embodiment, there is provided a drafting board having x and y axes and of a predetermined size for a specifically desirable paper size, the drafting board having indicia in juxtaposition to and following each edge of the x and y axes and the bottom edge of the drafting board being of a width sufficient to support two spaced-apart roller surfaces of a T-square to be positioned on the drafting board, the bottom edge's width extending laterally across the board's bottom as a planar surface, and a T-square having a straight edge along a first longitudinal axis that extends from bottom to top of the board when placed thereon, and the T-square having a helve head unitary with a proximal end of the blade, and the helve head having a second longitudinal axis extending substantially at a right angle to the straight edge and extending substantially parallel to the board's bottom edge and to the planar surface of the board's bottom edge, and structure of the helve head along the second longitudinal axis c

Abstract: A fastening apparatus for a measuring device including a bending resistant scale comprises a plurality of resilient fastening elements for mounting the scale to a support surface. Each of these fastening elements is securely mounted to a support surface and acts resiliently to apply a mounting force to the scale, which mounting force is sufficient to hold the scale in place, substantially without distorting the scale. In the illustrated embodiment the mounting force is independent of the force with which the fastening elements are mounted to the support surface.