Abstract: A suction control system is provided for use by surgeons in recovering blood from a patient during the course of a surgical operation. A blood suction line extends from a pick-up tube, which is placed in the blood pool of the patient, to a cardiotomy reservoir. Attached to the blood suction line, but not communicating with it, is a vernier control valve to which two vacuum lines are connected and which valve is formed with a port and connecting passage between the two vacuum lines. One vacuum line is connected to a vacuum source while the other vacuum line connects to the cardiotomy reservoir. The valve is formed with an internal passage connecting the two vacuum lines and a port open to the atmosphere and communicating with the passage. The surgeon holds the valve unit in his hand with his thumb over the port.

Abstract: A vaccine for Tyzzer's disease in rabbits is produced from inactivated hepatic or intestinal tissue of immunosuppressed rodents which have been infected with Bacillus piliformis.

Abstract: A computer controlled high resolution radiaoactivity distribution detection system is provided for sensing radioactive events in a biological specimen. The system includes a rotating disc memory which contains instructional data for controlling the computer. Radiation emitted from a subject positioned on programmable XY platform is directed through a collimator and is detected by means of an array of sensing devices and front end electronics. The detected radioactive events are temporarily held in a buffer memory under control of the computer for storage. The temporarily stored data is fed via the computer to a disc memory for long term storage, a disc controller constitutes an interface to the disc memory. The stored data is then applied to a display via computer for presentation.

Abstract: An operator controlled roof bolter with a flexible shaft drill and a roof bolt inserter for drilling and inserting a roof bolt into an unsupported roof of a mine while the operator is positioned at an outby station under a supported roof. The flexible shaft roof drill is constrained to a frame of the roof bolter for pivoting movement between a rest position and a working position. The roof bolt inserter is mounted on a slide for linear movement and limited rotational movement between a retracted position and an extended position for positioning a roof bolt held by the inserter into registration with a hole drilled by the roof drill.

Abstract: A pressure sensitive adhesive coating is applied to selected regions of one face of a release web, other regions of the one face being free of the adhesive coating. A photographic print is superposed on the release web face having the adhesive and the adhesive free regions, the back surface of the print contacting the adhesive coating. The release web is slit along a line that extends the length of the print and passes over the adhesive free regions. The slit forms a pair of tabs in the release web at the adhesive free regions. The tabs facilitate removal of the release web without bending of the photographic print.

Abstract: The signal from the crossover network of an audio output circuit is applied to certain of the audio system's low, middle and high frequency speakers through particular compensation circuits that are associated with the crossover network and the speaker driver coils. These compensation networks include: a resistor-inductor-capacitor sequence of selected values connected across the terminals of a high frequency or other driver whose resonant impedance peak must be compensated to a resistive impedance for optimum crossover; a resistor-capacitor sequence of selected values connected across the terminals of a low frequency or other driver whose inductance must be compensated to a resistive impedance for optimum crossover; and a variable inductor connected in series with one or more of the terminals of any driver where a "roll off" at higher frequency may be desired. The result is more faithful audio reproduction.

Abstract: A display system in which a video signal derived from digital data is processed in a processor in order to produce an analog image of the digital data on a cathode-ray tube display by intensity modulation of the display beam according to an approximate two-dimensional Gaussian spread function centered about each digital data point.

Abstract: Contact lenses, particularly for aphakic eyes, are characterized by a rear conicoid optical surface that is fitted to the cornea and a front prolate ellipsoidal optical surface of particular power, these surfaces having functionally related configurations.

Abstract: Wooden gutters are protected against the weather and their useful life extended by applying a flexible plastic liner along the trough of the gutter and closing the ends thereof with sealing caps. The liners and caps are tightly secured in place to prevent water from seeping in-between the liner and the wood gutter. The liner is of extruded, flexible plastic material contoured to fit snuggly within the gutter trough and is readily cut to a length corresponding to the length of the gutter. The end caps may be made of injection molded plastic parts formed with cooperating grooves to receive the ends of the liner, and connectors are provided to join adjacent sections of liners. Other components include corner joints, drain connectors and lifters to provide a pitch to the liner to ensure drainage.

Abstract: An inflated floating bridge piece is provided for use on eyeglass frames to increase comfort, reduce slippage and allow for height adjustment of the glasses. The bridge piece is in the form of a resilient, hollow member having one or more air chambers in an inverted U shape adapted to fit over the bridge of the nose in place of conventional eyeglass bridges. The inner wall of the bridge is thinner than the outer wall to provide control over bridge pressure and an adjustment plate bears against the cross piece to selectively adjust the pressure in the chamber or chambers.

Abstract: An integrated combination pedestrian sign and push button is provided for use particularly with respect to the mounting of pedestrian actuated switches for controlling traffic lights. A saddle is formed with a semi-cylindrical, longitudinally extending, concave rear face conforming to the contour of a cylindrical post to which the unit is normally mounted and a front face formed with raised letters presenting pedestrian information. The upper and lower ends of the saddle are formed wtih arcuate grooves on the front face thereof for engagement by metal banding straps employed to secure the saddle to an appropriate post. A manually operated push button switch for pedestrians is mounted to the lower front face of the saddle for connection with traffic signal control circuits.

Abstract: A method and apparatus are provided for monitoring tire pressure for motor vehicles, or the like, in which coded sound signals emitted from a wheel-mounted sound signal generator are detected and processed. The coded signal from the generator serves to distinguish the sound signal from background noise. The output of the generator is comprised of at least two coherent frequencies that beat acoustically with one another to produce an amplitude modulated sound signal that is then detected by a transducer which converts the sound signals into the electrical signals. The electrical signals are then fed through the processing circuitry including a detector which extracts the modulation envelope and applies it to an audio band-pass filter. The filter accepts the envelope within a predetermined frequency range, eliminating all signals which are not within the designed band pass. A second detector converts the audio signal to a DC level and feeds it to a threshold comparator.

Abstract: A machine is provided for use by draftsmen, illustrators and artists in making various axonometric or three dimensional drawings, such as isometric, dimetric, trimetric as well as perspective views. The machine includes a flat working surface which supports drafting paper or the like placed thereon. Provided along the borders of the working surface and visible to the draftsman are changeable construction guide lines along with ellipse angle selection data by use of which the draftsman may prepare various types of three dimensional views. The construction guide reference lines in one embodiment are provided by means of a printed chart on a roll which moves under the working surface, and by moving the chart in one direction or the other the reference lines may be moved according to the requirements of the drawing to be made.

Abstract: A semiconductor thin film and glass stratum laminate is formed by depositing a semiconductor thin film onto a temporary substrate having a carbon coating to which the film adheres. Processing of the semiconductor thin film for selected performance characteristics is accomplished while the film is affixed to the temporary substrate. The processed thin film is transferred and electrostatically bonded to the glass stratum by exposure to a thermal environment at or below the softening point of the glass stratum and by application of an electric potential across the thin film and glass. The bonded thin film and glass stratum laminate is separated from the temporary substrate.

Abstract: A modular, heat recovery system is provided for use with furnaces, boilers, and the like where otherwise waste exhaust heat is utilized to heat water for home or apartment use. This system includes a plurality of modular pipe loop sections interconnected with one another and mounted in proximity to the stack of the furnace. Each section includes several courses of longitudinally extending U-shaped loops supported on a common perpendicular pipe section at one end and which forms part of a supply line for other sections. Each section is provided with unions and valves by means of which an entire section maybe disconnected for repairs from the other sections without interruption of the operation of the other sections. A drip pan is provided at the lower end of the system to prevent water leaks from dripping onto the furnace.

Abstract: A precision centering device with a pair of relatively movable plates forming a guideway for four relatively movable guides. A tapered centering port having a rectangular profile is formed by the guides which are constrained for mutual coacting movement by the plates. The relative positions of the movable plates define the geometric shape of the centering port and the relative locations of the guides determine the size of the centering port. A reciprocating collet configured to carry a semiconductor chip is received within the centering port at the center thereof. As the collet moves downwardly, the chip is guided through the tapered port and is centered on the collet.

Abstract: A safety attachment is provided for use with a rotary lawn mower to prevent substantial injury to anyone whose extremity may accidentally strike the cutter. The attachment includes a relatively large annular disc mounted to the drive shaft of the motor for rotation about a vertical axis and at least one cutter bar mounted diametrically across the disc on the underside thereof. The disc diameter is substantially equal to the length of the cutter bar. In one embodiment slots are provided adjacent to the leading edges of the cutter bar and impellers are provided on the upper side of the disc adjacent the slot fordischarging cut grass through the side of the machine. The combination of the disc and the cutter bar provides good grass cutting action and at the same time greatly reduces the risk of serious injury in the event that one's foot, for example, accidentally slips in under the mower.

Abstract: Testing of rheological properties of a fluid is performed between a pair of members having cooperating faces, each characterized by minute, randomly interspersed land portions and cavity portions. The land portions of each face are planar and are disposed geometrically in a common plane. The cavity portions are irregular and are disposed in a network subordinate to the common plane. Testing involves the steps of placing a sample of the fluid between the cooperating faces, pressing the cooperating faces into flush contact with each other, and pulling the cooperating faces from each other. The force required for rupture of the fluid within itself, without first breaking its contact with the cooperating faces, is a function of the shear stress, yield point and other rheological properties of the fluid.

Abstract: A mucus sample from a bodily cavity is introduced between inner and outer bearing members, one of which is fixed, one of which is biased, and both of which have bearing surfaces of predetermined surface finish. Relative mechanical movement of the members indicates menstrual cycle phase.