Abstract: Disclosed are a method and apparatus for measuring the density of a suspeon wherein the suspension to be measured is first subjected to pressurization or depressurization in a closed container by means of a compressor or a vacuum pump to extinguish air bubbles and gas bubbles which would otherwise cause measurement error, and the measurement of the density of the suspension is then achieved with high exactitude in a bubble free state.

Abstract: A method and means for hydrostatically testing the expansion of a vessel immersed in a fluid-filled jacket when subjected to an internal pressure to thereby determine total expansion and permanent expansion of the vessel. A conical pan is suspended from the sensing element of an electronic balance and means are provided for conducting fluid from the jacket to and from the conical pan without physically contacting the same. When pressure is applied to the vessel, the fluid expelled from the jacket is conducted into the pan, the electronic balance providing an indication of the total volumetric change in the vessel. When the pressure is released from the vessel, the fluid is conducted from the pan back into the jacket whereupon the electronic balance provides an indication of the permanent volumetric expansion.

Abstract: An apparatus for testing the strength and/or the leakproofness of seams or joints formed between synthetic resin sheets comprising a semicylindrical shell of transparent material having rounded closed-in portions and forming with its peripheral edges, sealing strip means surrounding said opening a continuous frame for engaging said strip means and a flexible closure means operatively associated with said frame for sealing off the opening whereby a test chamber is formed and pump means connected to said chamber for applying a vacuum thereto.

Abstract: A device for determining the rheological properties of a fluid comprises a pair of cooperating members, the working face of each member defining parallel discrete ridges or flutes, the outermost portions of which define ridge lines, the ridges of one member being crossed with respect to the ridges of the other member. A fluid sample is applied to the working face of one member and the working faces are pressed together so that the ridge lines of one member intersect the ridge lines of the other member at a matrix of points and so that volume increments of the fluid sample are defined. The contact surface area of the fluid sample with the substrate is substantially greater than the surface area of the general interface between the working faces. The force required to separate the fluid at the general interface defines the rheological properties of the fluid with improved accuracy.

Abstract: A sampling device for determining scale build-up on the walls of a vessel, one wall of the vessel having a sampling aperture therein to receive a sample member therethrough, the sample member remaining within the vessel during operation and including means to check scale build-up on the member without interfering with the operations going on inside the vessel.

Abstract: Method and apparatus for applying controlled electromagnetic force to a test specimen such as a turbine bucket to induce vibration in the specimen. The force is applied by means of an electromagnetic field produced by an electromagnet. A controlled power source supplies current to the electromagnet to maintain the applied force at a predetermined magnitude over a predetermined range of frequencies. A comparator controls the power source in response to a sensor signal representative of the frequency and magnitude of the face actually applied so as to maintain at a minimum the difference between this signal and a reference signal representative of a desired frequency and magnitude. Tuning means are provided to nullify capacitive reactance of the electromagnet which would otherwise tend to limit the current supplied by the power source as frequency is increased.

Abstract: A static monitoring device (such as a corrosion coupon) manipulating apparatus for petroleum pipelines is described which allows the monitoring device to be run in and later pulled out without depressurizing the pipeline. Part of the apparatus can be removed while the monitoring device is in the pipeline, thus greatly reducing the likelihood of damage to the apparatus and pipeline. The removal of a portion of the apparatus also allows this portion to be reused to manipulate monitoring devices at different locations.

Abstract: A pressure measurement sheet comprises a support and a layer containing microcapsules provided thereon, wherein the ratio of the number average wall thickness (.delta.) to the volume average particle diameter (D) of the microcapsules lies in the range: .delta./D = about 1.5 .times. 10.sup.-.sup.3 to about 3.0 .times. 10.sup.-.sup.2. A method of measuring pressure by the use of the pressure measurement sheet described above comprising the steps of contacting the pressure measurement sheet with the area to be measured, applying pressure to form color and determining the applied pressure from changes in optical densities or hues, where the color is formed through contact under pressure between a layer containing microcapsules and a layer containing an adsorbent.

Abstract: A capacitance-type transducer used for the measurement of bending strains test elements which are not sufficiently strong to support a strain element or for test elements in which a strain element would strengthen the test element and not give an accurate test. The transducer is formed by a spring wire which has a portion perpendicular to the test specimen with a U-shaped end extending from the perpendicular portion. One portion of the U-bend has an insulator about the wire where the insulator parallels the test specimen surface and is in contact therewith. The end of the wire has a flat conductive plate secured thereto with the flat plate parallel with the specimen. The spacing between the flat plate and the specimen forms the capacitance spacing which changes as the specimen is strained in a direction perpendicular to the flat plate. The distance between the flat plate and specimen is represented by a change in capacitance which is measured by an oscilloscope.

Abstract: An average fuel consumption rate measuring system wherein the distance traveled by a vehicle per unit fuel consumption is computed and indicated to let the driver know the driving conditions of the vehicle and instruct the driver in economical driving. Namely, a first electrical signal is generated for every predetermined distance traveled by the vehicle and the signals are integrated to indicate the total distance traveled, while on the other hand a second electrical signal is generated for every predetermined amount of fuel consumed by the vehicle and the signals are integrated to indicate the total fuel consumption, and one of the integrated value is divided by the other to indicate an average fuel consumption rate.

Abstract: A well logging instrument comprises a focus section having a focus upper guard, a center electrode and lower focus guard. The bottom section of the instrument includes a pad device having electrodes on its borehole wall-engaging surface and adapted to be urged against the borehole wall and also having a plurality of pressure relief holes formed therein to reduce differential pressure which might otherwise build up between the surface of the pad and the borehole wall. The remote electrode of the focus portion of the instrument is the armor surrounding the logging cable. The lower focus guard serves a dual function in that it is also the mini-focus remote electrode. Means are provided for measuring the potential between the focus guard and the cable armor and also between the microguard and the lower focus guard, both measurements then being sent up the logging cable to the surface electronics.

Abstract: A system is disclosed for decelerating a rifled projectile in flight. A gun ore rifled with a land pattern having a characteristic number of turns per bore diameter, has a muzzle at a first angular orientation along the projectile's flight axis and a characteristic recoil distance. A deceleration tube having an opened end is located at a separation distance from the gun muzzle along the flight axis. The deceleration tube has a rifled land pattern with a second angular orientation at the opened end, displaced from the first angular orientation substantially by the product of the characteristic number of turns per bore diameter times the sum of the separation distance and the characteristic recoil distance. When the projectile is fired from the rifled gun, it has a rifle pattern engraved thereon and it travels along the flight axis undergoing rotational motion imparted by the rifle land pattern of the gun.

Abstract: A digital electrohydraulic steam turbine control system that generates a feedforward total steam flow demand signal to position the governor valves singly or sequentially in accordance with a dynamic nonlinear representation of steam flow vs. valve lift position having provision for testing the throttle valves while the turbine is operating in either the single or sequential mode and without effectively disturbing the load on the turbine and without the necessity of turbine operational feedback loops in service, is disclosed. Decremental and incremental flow changes for each of the governor valves in the test path and the non-test path, respectively, are calculated iteratives in accordance with a non-linear valve flow vs. valve lift position characterization for the total steam flow to the turbine.

Abstract: An oceanographic water sampling device. A container has a pair of covers closably mounted and means connected to close the covers. Means are provided to add chemicals to the trapped water in the container at the same location where and when the sample is taken. Ampules containing the chemical are mounted in the container and knives are connected to break the ampules at predetermined times. A time delay device is provided so that a first chemical may be added to the trapped water at a certain time, and the second chemical may be added to the trapped water after a predetermined time delay.

Abstract: A low friction absolute pressure continuous integrator having a vacuum pressure chamber carried by a frame and in which a pressure sensing means is mounted. The pressure sensing means is adapted to expand or contract in a straight line responsive to changes in the line pressure of the fluid flow of the meter. Either the chamber or the pressure sensing means is in communication with the absolute line pressure of the fluid flow, with the other one being evacuated to substantially zero absolute pressure. A link transfer assembly interconnects the pressure sensing means with a continuous integrator assembly whereby variations of the absolute line pressure are converted to a standard pressure to permit totalizing of the standard volume at a corrected counter. An uncorrected totalized volume is simultaneously taken at an uncorrected counter. The working pressure for a device embodying the present invention is in the range of 0-45 psig.

Abstract: A level-sensitive system responsive to the level of liquid in a container is provided. A level-sensitive device, e.g. a gauge or pressure switch, is connected by a line to a lower portion of the container. Gas, specifically air, is supplied to the line under pressure sufficient to enable the gas to pass slowly into the container and to bubble upwardly, thereby keeping the liquid out of the line and away from the level-sensitive device. The flow of the gas is sufficiently slow that it does not affect the operation of the level-sensitive device. A liquid such as water also can be supplied to the line under pressure to flow into the container. The quantity of the water is also maintained small enough so as not to affect the operation of the level-sensitive device. The water is effective to prevent growth of fungus or the like in the liquid of the container which otherwise can form adjacent the line leading into the container and block the line after a period of time.

Abstract: An improved measuring lance to be inserted into a bath of molten metal, for example, molten steel, is disclosed having thermocouples on its tip end and in its receptacle chamber, respectively. The lance is provided with means to discharge air from inside a cover for a thermocouple in a receptacle chamber. A deoxidation chamber made of steel may be provided in the lance. Means to spray gas from around the connector of the lance may also be provided. These means assure accurate measuring of the temperature, composition, etc. of the bath.

Abstract: Disclosed herein is an apparatus for injecting a quantity of sample liquid into a continuously flowing carrier liquid comprising a housing, a primary channel, carrier inlet and outlet means both connected to the primary channel to form a carrier conduit through the housing, sample inlet and outlet channels both connected to the primary channel to form a sample conduit through the housing, a normally closed pressure relief valve disposed in the primary channel between the sample conduit and the carrier conduit, and means to change the pressure differential between the liquid flowing in the sample and carrier conduits.

Abstract: The invention involves providing a device or devices whereby one or more samples of liquid, such as molten metal, may be readily obtained from a mass or stream thereof.

Abstract: The invention involves providing a unique device and method of obtaining a sample of liquid, such as molten metal, preferably from a stream thereof. The device embodies improvements with respect to structural characteristics and dimensional factors with regard to components through which the liquid flows, including the disposition and use of buffer means and/or deoxidizing means in the flow path of the liquid.

Abstract: The invention involves providing a device or sampler for obtaining a sample of a hot liquid, such as molten metal.

Abstract: The invention involves providing a device or devices whereby one or more samples of liquid, such as molten metal, may be readily obtained from a mass or stream thereof.

Abstract: Liquid-measuring apparatus for measuring the drainage of urine from a patient comprises a measuring cylinder and a bag which is of substantially larger capacity than the cylinder and is situated beneath the cylinder. Tubing extends downwardly to the bag from within a compartment of the cylinder, the compartment being formed by an additional tube which is closed at its upper end and perforated near its lower end. The cylinder is vented to ambient atmospheric pressure above the level of the upper end of the tubing connected to the bag. Every time urine collected in the cylinder reaches this level, an automatic siphon action drains a predetermined quantity of the urine from the cylinder, through the compartment and the tubing, into the bag. The total quantity of urine drained from the patient can be measured at any time by means of a coarse reading taken from the bag and a fine reading taken from the cylinder.

Abstract: A method and circuit for use in determining unbalance of a rotary body having structurally predetermined compensation planes and restricted angular regions thereof in which the unbalance signals of the respective compensation planes are produced and applied to respective first and second inverting amplifiers if the compensation cannot be carried out in the compensation planes and a substitute plane is required. The outputs of the first and second amplifiers are added in a third amplifier whose output value varies as a function of the distance of the substitution plane from a compensation plane so that the output of the second amplifier, with the output of the first amplifier applied to its input, indicates the compensation in the substitution plane and the output of the third amplifier indicates the compensation in the other compensation plane.

Abstract: An integrating angular accelerometer for measuring angular rate of a rotating body has a stationary cylindrical inertial mass supported by a low drag hydrostatic bearing concentrically in a housing rotatable relative thereto and filled with a viscous fluid. An annular channel of laminar dimensions is formed between the inertial mass and housing and a vane is arranged in the channel to block fluid flow caused by rotation of the housing relative to the inertial mass. The differential pressure in the channel at opposite sides of the vane provides a signal corresponding to the rate of rotation of the housing relative to the inertial mass.

Abstract: A dynamically tuned gyroscope having a single gimbal has torsion flexures with torsional stiffnesses such that, at its tuned speed, the gyroscope is insensitive to angular vibration at a frequency of twice the rotor rotational speed. The drive shaft is connected to a first torsion flexure having an effective torsional stiffness K.sub.1 of zero, K.sub.1 being made zero by the use of ball races or pivots, by known mechanical methods such as over-center or toggle spring action, or by the use of magnetic or electrostatic systems. The rotor is connected to a second torsion flexure which is orthogonal to the first flexure. The second torsion flexure has a torsional stiffness K.sub.2 equal to 4w.sup.2 r.sub.3.sup.2 m.sub.3 where w is the tuned rotor speed, m.sub.3 is the component mass of a gimbal, on which the torsion flexures are mounted, on an axis through the center of gravity of the gimbal and normal to the plane of the gimbal, and r.sub.3 is the distance of the component mass m.sub.

Abstract: An elastomeric protector boot for covering the lower housing of a hydraulically operated impactor tool characterized by air vents which are adapted to allow free air communication between the interior of the boot while preventing debris from entering the lower housing of the impactor. The protector boot further includes an internal foam rubber filter member for ensuring that foreign particles do not enter the annular space between the bit and the housing. The air vents are further protected from being snagged or torn through the provision of protection lobes which allow air communication between the air vent while preventing ingress of debris generated by operation of an impactor.

Abstract: A derailleur gear for a bicycle comprises a chain displacement means having a rigid linkage part movable transversely of the rear wheel in a direction generally along the axis of the rear wheel of the bicycle, the linkage part forming a side link in a support parallelogram linkage that includes vertically movable interconnected link portions connected to the rigid linkage part, the support parallelogram being in a plane generally transverse to the axis of the rear wheel. The chain guide pulley or sprocket is rotatably mounted on a spindle carried by a vertically movable portion of the support parallelogram linkage, as is an elongated cap or arm member that supports a chain tension pulley at a remote end from the spindle-connected end. A coil spring normally resiliently biases the vertically movable portions of the support parallelogram upwardly generally towards the rear wheel axis, and various motion limiting features are included.

Abstract: A pulley is disclosed which comprises a hub, a firmly resilient collar affixed to the hub, and first and second annular sheet metal members surrounding the collar. The first annular sheet metal member has an outwardly flared margin and bushing portion which engages the collar outer surface with an axially extending press fit. The second annular sheet metal member has an outwardly flared margin adapted to oppose the first sheet metal member margin so as to form a groove for accommodating a belt. A bi-ended sleeve extends from this second member margin and is adapted to engage the first member bushing with an extended, nesting fit. A groove section is formed at the free sleeve end for accommodating a second belt. A radially inwardly extending free bushing end is adapted to engage a groove in the collar to further assist in securing the first sheet metal member to the collar.

Abstract: An endless power transmission belt made primarily of elastomeric material is provided and has a compression section comprising a plurality of teeth defining the inside portion of the belt and each of the teeth has at least one groove extending therethrough substantially transverse thereto.

Abstract: A component or balanced member for use on a shaft or lead screw having longitudinally extending transport elements has an internal bore with matching threads or lands therein to permit the balanced component to be mounted in operative association with the transport elements for movement to and fro along the given shaft, said component has a plurality of circumferentially spaced longitudinally extending slots having a length less than the length of the component so as to define therebetween a plurality of spaced connecting members each disposed between the ends of the component, and a resilient compression assembly is disposed about the medial section of the component for exerting a force on the medial section of each of the connecting members to adjustably fix the predetermined torque required to move the component when it is in assembled position on the associated shaft.

Abstract: A motorcycle brake assembly includes a mount attachable to the motorcycle frame; a braking cylinder on the mount and having a plunger; a plunger actuating lever pivotally supported on the mount; and a crank pivotally supported on the mount and having arms respectively operatively connected with the lever and with a brake pedal in such manner that the mechanical advantage of force transmission is increased as the crank is rotated by the brake pedal.

Abstract: An accelerator control assembly for an automotive vehicle, the accelerator control assembly being mounted under the instrument panel of the vehicle and includes a pivotably supported lever arm carrying a bumper stop adjustably positioned to be engaged by an element of the accelerator pedal linkage during acceleration, a torsion spring being operatively connected to the lever arm to provide for increased pedal effort during full acceleration, a vacuum actuator being operatively connected to the lever arm to effect positioning of the bumper stop as a function of engine vacuum and a control lever is operatively connected to the lever arm to permit the operator to position the bumper stop between a power setting and an economy setting for engine operation, as desired.

Abstract: Device for counteracting imbalance in a rotary body and automatically restoring it to a balanced condition. The device comprises a fluid-filled bore in which a throttling member moves freely, which transmits the pressure differentials developed about the axis of rotation during rotation of the body to a balancing mass movable in chambers disposed about the bore to displace the balancing mass a distance proportional to the pressure differentials and is effective upon the balancing mass to restore the body to balanced condition.

Abstract: A balanced multiple-throw crank-shaft wherein the free forces of the first and second orders forming resultants for the whole crank-shaft of the forces produced by each coupling are substantially zero and at least some of the crank-throws are shifted or offset angularly, respectively, by such a small angle in one direction of rotation and by such an amount relative to the corresponding circumferentially uniformly distributed angular positions they would assume in a configuration with angularly equally spaced crank-throws in orthogonal projection on a plane perpendicular to the geometrical spin axis of rotation of said crank-shaft that an improved balancing ratio will result therefrom.

Abstract: A clutch for disconnecting a drive shaft of an electric switch from a switch actuating element which includes a rotary shaft, particularly useful for the return or trip-free release of a rotary switch, comprises a differential gearing coupled between the rotary shaft of the actuating element and the switch drive shaft. The gearing includes a first gear connected to the rotary shaft for rotation therewith, a second gear connected to the drive shaft for rotation therewith, idler gears meshing with the first and second gears and transmitting rotation from one to the other, and a housing carrying the idler gears and mounted for rotation. A releasable latch carries the idler gears and is arranged selectively to permit and stop rotation of the gearing housing.

Abstract: An adjustment plate is mounted on the shaped front portion of a motorized grinder used to sharpen a saw chain. The plate extends from the grinder to a position adjacent the grinding element whereby when the plate and grinding element are placed on a saw chain, the plate may be adjusted with respect to the grinder and the saw chain to enable different saw chain cutting links to be sharpened or the depth gauge portion thereof to be ground by different size grinding elements.

Abstract: Disclosed herein is apparatus for rotating the bushings of an assembled and in-place track of a tractor to present new bushing wear areas to the sprockets which engage these bushings. The apparatus includes a clamp member which is capable of applying rotative force to the bushing to be rotated and means for providing such necessary force.

Abstract: A bakery product slicer and method for forming vertical slits extending along proof lines between adjacent buns in clusters of buns. The slicer includes a rotary vertical slicing blade located in the path of movement of clusters past the slicer at the nominal location of the proof line and a fixed aligner having a heel portion with a curved bow and divergent flanks located upstream of the blade with plates extending from the heel portion to either side of the blade and beyond the downstream edge of the blade so the blade is fitted in a slot between the plates. As clusters are moved toward the aligner the open crease above the proof line is moved adjacent the heel portion of the aligner so that the flanks engage the buns and assure that the proof line between the buns is held in alignment with the fixed blade so that the vertical slit extends along the actual proof line.

Abstract: A novel compound angle cutting edge configuration on a die rule, slitter blade, hollow punches, shearing blades, etc. provides cleaner cuts on stock material with less tonnage, improved cutting and cleaner cuts. The die rule cutting edge includes a plurality of side by side notches on only one side of the cutting edge defining a plurality of equally spaced piercing points. A primary cutting edge extends from each piercing point substantially to a next adjacent piercing point and forms a compound angle with an imaginary line through the tips of the piercing points of between about one and fifteen degrees. In use, the cutting edges are axially pressed through stock material to cut blanks of predetermined configuration. The cutting action consists of the piercing points penetrating the material and then the primary cutting edges slicing the stock material from one penetration point, substantially linearly and unidirectionally, to the next adjacent penetration point.

Abstract: The provision in a conventional punch press of a cyclicly-operable transfer mechanism which is adapted to be bolted to the stationary die shoe of the press in between successive forming stations and has associated with it a pair of blank-gripping jaws which travel generally in web line fashion between first and second stations for blank-transferring purposes while at the same time rotating so that each blank is reversed from end to end upon completion of the transfer operation. During the transfer, the jaws swing or revolve in a circular path about a vertical axis so that directional reversal of the jaws accounts for a major portion of the blank displacement.

Abstract: A metal saw is mounted upon a tippable arm above a table and is lowered to cut a work piece on the table. The saw and the tippable frame supporting it are mounted upon a vertically axised swing arm which has its vertical axis extending upwardly through the table in the plane of the saw blade and adjacent to the saw shaft. The tippable arm and the swing arm are laterally offset from the plane of the blade to permit the blade to be swung from a normal crosscut position perpendicular to a longitudinal edge of the table to selected angular positions and to a ripping position parallel to the edge of the table. The portion of the table immediately below the saw blade is formed as a disc which includes a slot wherein the edge of the saw may drop and which is axised to the swing arm to rotate with the swing arm and saw.

Abstract: A waveform converter for an electronic musical instrument wherein an input rectangular wave tone signal is supplied to a frequency-voltage converter to generate a D.C. voltage control signal having a voltage level corresponding to the frequency of the input rectangular wave tone signal; and a one-shot multivibrator is triggered by the input rectangular wave tone signal to produce an output rectangular wave tone signal having the same frequency as the input rectangular wave tone signal. The one-shot multivibrator comprises duty factor control means responsive to the D.C. control voltage signal for determining the duty factor of the output rectangular wave tone signal.

Abstract: This disclosure pertains to a novel wind instrument having a range of two octaves. Seven lettered note keys, starting with C, each can be individually depressed to produce a tone. An octave bar, when simultaneously depressed, produces the corresponding tone in the next higher octave. Scale programming buttons, when once depressed, select a sharp, natural, or flat tone which is now produced when depressing the lettered note key, in accordance with the composition's key signature. Means are provided to quickly reset the program by first making all lettered note keys natural and upon further simple manipulation, selection of the new scale program may be obtained. To avoid disturbing the program set by the scale buttons, a group of buttons provides tones in an accidental register which, upon their depression, will produce accidental notes not included in the main key.

Abstract: A chord inversion coordination aid comprises a plurality of dials of increasing diameter and each representing a particular chord type and having a peripheral array of the scale tone names of the chord in its root and inverted positions arranged in sectors, whereby upon aligning various sectors of the discs a given chord progression can be arranged according to the most easily played chord inversions. The dial may be centrally pivoted behind a cover sheet having a window therein to expose the dial sectors, and a pad of staff paper may be mounted on the cover sheet.

Abstract: A nail constructed with conventional heading equipment with a notched open-sided partially circular head having a pair of annularly spaced radially extending ribs depending from the underside thereof to permit burr growth without interfering with the interengagement of the downwardly facing abutment surface areas of the rib with upwardly facing mating abutment surface areas of the top surface of the head of an adjacent nail when a plurality of such nails is collated and secured in an angle stick package with the shanks and heads of adjacent nails in abutting relation.

Abstract: In a blind self-plugging rivet of resilient nylon-66 material the stem head has an annular projecting barb adjacent the breakneck, and the shell has a short counterbore at its head end into which the barb expands, when the stem head is fully pulled into the shell, to assist in locking the stem head in the shell. At its tail end the shell bore has a plurality of annular faces arranged step-wise, to engage behind the end face of the stem head over a range of possible positions of the latter depending on the thickness of the riveted members.

Abstract: A metal expansion anchor sleeve is made by forming an elongated flat sheet metal blank so that it has a longitudinal slot extending inwardly from one of its ends and dividing it into two sections which are connected at the other end and which are each provided with a projecting tongue located in the region of the one end. Each tongue is thereupon bent back onto the respective blank section so that its free end moves through more than 180.degree., the bending being over a radius equal to at least half the thickness of the blank. The blank is then arcuately bent transversely to the elongation of the slot and formed into an externally substantially cylindrical expansion anchor sleeve having an inner longitudinal passage which, due to the presence of the tongues, diverges in direction away from the one end, i.e., converges towards the one end which is the leading end of the sleeve.

Abstract: A firearm capable of shooting in bursts, or to fire shot by shot, or to have a safety position in which no firing is possible. The firearm includes a firing selector in the vicinity of the trigger. The firing selector is arranged so that its outer part can occupy a central position symmetrical with respect to the vertical plane passing through the axis of the firearm, a right-hand eccentric position located to the right of the plane, and a left-hand position located to the left of the plane. The central position corresponds to the "safety" position of the firing selector and the two off-center positions correspond to the "burst" and "shot-by-shot" positions. In a first embodiment, the firing selector slides in a direction perpendicular to the vertical plane passing through the axis of the firearm, and is formed by a slide which has a stepwise inner part and an outer part formed by its two ends which protrude on the right-hand and left-hand sides of the firearm.

Abstract: Apparatus and method for setting and machining the surface of at least one workpiece. The apparatus includes a structural member, means for supporting the structural member for transverse and longitudinal movement, and, a cutting device and a spacing block serially mounted on the structural member. The cutting device and the spacing block are disposed on the structural member such that the machining surface of the cutting device is located in a plane outside the plane of at least one side of the spacing block by a distance sufficient to remove a predetermined thickness of material from the workpiece.