Abstract: A digital magnetic recording system in which information is recorded as transitions between regions magnetized in opposite senses. In the read channel the output of the read head is applied to modulate a carrier, passed through a surface acoustic wave transversal filter and then demodulated, and the resulting transformed waveform is sampled. The surface acoustic wave transversal filter is designed to control the manner in which the transformed versions of elementary read pulses interfere at the sampling instants in such a way as to facilitate recovery of the recorded bits.

Abstract: A heat insulating roof structure for an industrial building, in the form of an inter-purlin system comprising spaced parallel purlins (10, 10A or 35, 35A or 45, 45A) having their base webs (14 or 41 or 50, 51) sheathed by a heat insulating sleeve (16, 17 or 53, 54 or 56, 57), thereby to provide lateral platforms on opposite sides of the purlin for the support of cross members (29 or 70) which form trays to support a layer of heat insulating material (31). In one form of embodiment the cross members are inverted tee bars (29), thereby forming open rectangularly framed trays for supporting the insulating layer. In another form of embodiment the cross members are closed tray bases (70) especially suitable for a vapor sealed system. In all embodiments the insulating sleeve assembly (16, 17 or 53, 54 or 56, 57) serve to minimize or avoid the creation of a cold bridge between the warm building interior and the cold space above the insulating layer (31).

Abstract: A removable insert for a mold for impressing indicia on each molded product formed in the mold. The insert includes a plug body, a bore through the plug body, and a plug situated in the bore and having a mold engaging surface for impressing an article formed in the mold. The plug is rotatable and include an indicator which may be directed toward a series of indicia spaced about the periphery of the bore.

Abstract: A smoke and pollutant filtering device comprising a mask having a filter composed of a series of contiguous, serial layers of filtering material. The filter consists of front and rear gas permeable covers, a first filter layer of pressed vegetable matter, a second filter layer comprising a layer of activated charcoal adjacent a layer of aqua filter floss, a third filter comprising a gas permeable cloth situated between layers of pressed vegetable matter, and a fourth filter layer comprising an aqua filter floss. The first through fourth filter layers are sandwiched between the front and rear gas permeable covers. The filtering device is stitched together and mounted within a fire-retardant hood shaped to fit over a human head. Elastic bands are included in the hood to maintain the hood snugly about the head when worn.

Abstract: A wire matrix printing head moveable along a printing line on a record medium is described in which a ring of wire-selection electromagnets are grouped about the wire guiding arrangement, the electromagnets each having a basic yoke assembly with a pair of limbs each able to support a separate energising coil. The electromagnet armatures are supported by a common frame having a plurality of finger-like structures, one for each armature, on which the armatures are respectively pivoted. The printing wires are spring loaded into their restored positions and abut their respective armatures, which are supported in their respective unoperated positions each by an adjustable resilient backstop. The printing wires are supported in guides so that they are arranged in two columns, both the columnar pitch and the pitch of nominally adjacent wires in the columns being of the order of the wire diameter.

Abstract: A data processing system has a two-level storage system in which data items are copied from a main store into a smaller, faster slave store on demand. The mapping of the main store on to the slave store is a many-to-one mapping so that situations will occur where two required data items cannot both be present simultaneously in the slave store because they map on to the same location. The system has special logic which detects this situation and, upon detection, temporarily suspends the use of the slave store and instead uses a smaller first-in first-out area of storage.

Abstract: A liquid atomizing method and apparatus in which atomization is achieved through acceleration of a primary air flow injected through an upstream throat (58t) into a diverging passage (61) between the upstream throat (58t) and a downstream throat (68) to create shock waves in the air flow which impact a wall surface adjacent and generally opposed to a confined liquid column to create sonic and/or ultrasonic vibrations which are directed into the confined liquid column to cause the column to fracture into tiny droplets of a narrow size range below 50 microns in diameter. One or more auxiliary air flows may be injected through other upstream throats (60t) into the diverging passage (61) in the flow direction of the primary air flow downstream of the first throat to supply energy to the boundary layer and to enhance acceleration of the primary jet through entrainment. The effective cross-sectional flow area of the downstream throat (68) is between 1.25 and 1.

Abstract: A foundation unit which, when assembled, can be collapsed for compact storage and shipping and later can be elevated to a fully expanded state. The foundation unit includes a rectangular, grid wire top bearing structure, a rigid bottom substructure such as a wooden frame, and a series of spaced, parallel rows of substantially flat support members extending between the top bearing structure and the bottom substructure. The support members are hingedly secured to the top bearing structure and bottom substructure to permit reduction of the foundation unit to the collapsed state with the rows of support members lying essentially prone. In the elevated state, the foundation unit includes stabilizers which are oppositely reactive and which prevent relative longitudinal translation between the top and bottom of the foundation unit.

Abstract: A syringe needle removal and disposal device is disclosed and comprises cap means and a container. The cap means includes means for disengaging needles affixed to syringes and disposing used needles into the storage container. The cap means also includes movable closure means for controlling access to the storage container. The device is portable and ensures safe disposal of used needles for hypodermic syringe needles of the one ended variety, and blood sampling needles for both the one-ended and double-ended types.

Abstract: Each half set of wheels comprises a telescopic shock absorber - suspension spring assembly which is fixed in its upper part to the body of the vehicle and is rigid in its lower part with, on one hand, a ball of a ball joint articulation of a suspension arm and, on the other hand, a hub support. The hub support comprises a stub-axle supporting side member connected by upwardly extending inclined branches to the sleeve supporting the body of the shock absorber. In its lower part, the side member carries a second ball joint articulation of a lower suspension arm and the transverse transmission extends between the lower and upper suspension arms. The centers of the two ball joint articulations are in alignment on the axis of the shock absorber.

Abstract: A transporter car for carrying a metal coil comprises a wheeled trolley with first and second supports for engaging the periphery of a coil to provide supports for the coil. The supports are arranged in side-by-side relation in the direction of movement of the trolley and one of the supports is retractable so that it can be used in combination with the other support for long coils and the other support is used on its own for short coils.

Abstract: A surface drainage culvert of the type comprising a pipe section which is cut longitudinally forming an aperture along the upper surface of the pipe and which has an upstanding grate assembly lodged within the aperture.The aperture consists of a series of longitudinally spaced slots in the pipe with unslotted pipe portions separating each slot. The grate assembly consists of a pair of spaced, parallel sidewalls which form an inlet drainage passage to accept drainage water inflow at the top of the passage and discharge the water at the bottom of the passage through the aperture into the pipe. Lateral stiffeners maintain the spacing of the top of the drainage passage, while a spacer means, situated within a guide formed in the grate assembly sidewalls, maintains the spacing of the sidewalls at the bottom of the drainage passage.

Abstract: A marking device for a shorthand machine selectively marks the margins of the paper tape output of the shorthand machine to denote a portion of the shorthand notes for ready reference. The activating keys for the device are located in close proximity with the machine keyboard, whereby the operator may activate the device with minimal interruption of the recording process. Disposable marking instruments may be employed in the device. Incorporation of the device in the machine cover preserves the first planar surface of the cover and further, facilitates storage of the device when not in use.

Abstract: A shorthand machine including an electric drive system to advance the platen. In accordance with the invention, the platen can be advanced in a fully mechanical, conventional mode, fully electric mode, or by a combination of electric and mechanical drives. In the electric or electric/mechanical modes, after the shorthand machine operator makes a key stroke and releases the keys, an electric circuit pulses an electric motor connected to the platen to drive the platen for a predetermined duration of time. Subsequent to the driving pulse, power to the motor is reversed to quickly brake the motor and bring it to a rapid stop. The duration of time that the motor is activated may be varied, varying the amount of advancement of the platen, and thus varying the distance between received key strokes for each word or part of word generated by the operator of the shorthand machine.

Abstract: A method and apparatus for virtually eliminating the web-like "jetting" lines on finished injection molded products by utilizing an expandable cavity which is initially set at a reduced or minimum size to intercept resin flow and disperse it as it enters the cavity, the resin being maintained under pressure within the partially filled cavity, wherein the cavity expands under pressure of the resin flowing therein until the finished size of the end-product is attained.

Abstract: System for extracting timing information from a digital waveform supplied to the system in which the waveform is modulated by a modulator, passed through a surface acoustic wave transversal filter and demodulated by a demodulator. Zero crossings in the resultant transformed waveform are detected by a detector and used to determine the times at which another version of the original waveform is sampled by a sampling circuit.The characteristics of the surface acoustic wave transversal filter are chosen to be such that each elementary pulse in the original waveform is transformed into an oscillatory waveform, the zero crossings of the different oscillatory waveforms coinciding with one another and defining the sampling times.

Abstract: A lightweight container having a readily removable corrugated sidewall. The inner ply of the sidewall is a corrugated sheet having a selected length and width. A bottom wall member is positioned adjacent the lower axial edge of the inner sheet. A flat outer sheet, of selected length and a width greater than the width of the corrugated inner sheet, is joined to the inner sheet to define the outer ply of the sidewall. The outer sheet projects beyond the lower edge of the inner sheet and is folded against and secured to the bottom wall member, to thereby restrain movement of the bottom wall member. A frangible joint is defined along which the sidewall can be severed from the bottom wall without severing the corrugated inner wall, so that the inner wall adds rigidity without interfering with the ready removal of the sidewall. In the preferred arrangement, the adjacent ends of the inner sheet are in a substantially abutting and unsealed relationship to assist in the opening of the container.

Abstract: An adjustable muffler for a percussion instrument, such as a bass drum. The muffler includes a supple material which is situated contiguous to the head of the drum, one or more elastic strips to maintain the supple material in contiguous relationship with the drum head, and a cord situated to selectively withdraw successive portions of the supple material from contiguous relationship to the drum head in order to alter the degree of muffling produced. The supple material, which may be of felt, fur or any other suitable soft, flexible material, lies adjacent only a portion of the drum head bounded by a chord and the circumference of the drum head. The cord is attached through the top of the supple material and is located so that as the cord is tensioned, successive portions of the supple material are selectively withdrawn from contiguous relationship to the drum head.

Abstract: A golf bag assembly for individually supporting and protecting a plurality of golf clubs including a plate member secured to the bag and extending across the bag in proximity to the open upper end. The plate member includes a plurality of apertures to receive the shafts of golf clubs and boss portions extending a selected distance downwardly aligned with each of the apertures. A plurality of elongate golf club protecting tubes are engaged with said boss portions below said plate and extend downwardly into the bag. The protective tubes do not need reinforced rims. Golf clubs can be inserted within the golf bag and within each of the protective tubes without any damaging engagement between the clubs and the top portions of the tubes.

Abstract: A variable delay circuit consists of a chain of logic gates with a selection circuit for selecting the output of any chosen one of the gates. A variable voltage is connected to the emitter load resistors of the gates, and permits the overall delay to be adjusted.