Abstract: A reprographic camera is described having a table for an original subject, an objective and an image frame. One of these parts is fixed and the others are relatively movable to produce variable scale images or reproductions of the original. The movable parts are coupled via a transmission member which gradually changes the ratio of the lengths of their displacements throughout their ranges of movement.

Abstract: In a digital electronic organ or the like external waves of controllable duty cycle are used to control the on time of a field effect transistor (FET) through which a capacitor is charged. A similar rectangular wave of controllable duty cycle is applied to a second FET to control the on time thereof for controlling the discharge of said capacitor. The state of charge of said capacitor is used to control the conductivity of yet another FET through which a desired frequency is conducted to effect enveloping of such frequency with the desired attack and decay characteristics.

Abstract: There is disclosed an air dryer system for removing moisture from compressed air. The system includes a coil means including a plurality of axially spaced convoluted tubing sections wherein each tubing section has an inlet adapted to be coupled to the compressed moist air to be dried and an outlet. The system further includes a cooling means for reducing the temperature of the moist air within the tubing sections for causing the moisture within the compressed air to condense for forming moisture laden air at the outlets, and a moisture separater directly connected to each of the tubing sections for removing the condensed moisture from the moisture laden air to thereby provide dried air for use by pneumatically operated or controlled tools or the like.

Abstract: A brake valve is disclosed, which is provided with an enlarged chamber, at one end of which is slidably disposed an annular piston. A reaction piston is carried on a valve rod; the reaction piston radially extends so as to cover the annular piston. When the reaction piston moves toward the annular piston, flow of fluid through the valve is restricted and then halted. Mating beveled conical surfaces are provided on the annular piston and the reaction piston to provide a mutual centering and seating action as the reaction piston is moved toward the annular piston. Belleville washer elements are stacked in opposed array on the valve rod for resiliently urging the reaction piston into engagement with the annular piston, and for inhibiting mechanical shocks from being transmitted from the valve rod to the reaction piston, and vice versa. Conical fluid flow stop members regulate the flow of fluid from the valve chamber to downstream brake elements.

Abstract: In a modular, expandable organ system comprising a plurality of large scale integrated circuit (LSI) chips an LSI chip is provided which produces chord and bass frequency generation and identification. It automatically coordinates with another chip in rhythm production. It incorporates frequency generators, identifies a chord played, and provides keyers for chord notes.

Abstract: A valve actuation system is provided for a valve of the type wherein at least two separate movements are utilized to achieve either opening or closing thereof. The actuation system includes a pair of hydraulic or pneumatic actuator units for automatically performing these two separate operations. An electrically energizable control valve is associated with each of these actuators for controlling the flow of a pressurized control medium therethrough to achieve actuation in the proper sequence for attaining the desired valve movement. A control circuit preferably comprises a plurality of switches responsive to the positions of these two valve actuators as well as the position, (viz., "valve open" or "valve close") of an operator accessible main control lever or switch. These switches deliver electrical power to energize the fluid flow control valves so as to automatically perform the correct sequence of actuator operations to open or close the valve, as desired.

Abstract: There is disclosed a system for dispensing feed and water for livestock which includes a container arranged to receive the feed and water and is adapted to permit access to the feed and the water by the livestock for consumption. The system further includes a feed delivery means for dispensing feed into the container and water dispensing means for dispensing water into the container means. The water dispensing means includes a delivery portion extending into the container which houses a water level sensor. A control means is arranged to actuate the feed delivery means to dispense a controlled amount of feed into the container and is also arranged to actuate the water dispensing means to dispense water into the container through the delivery portion after actuation of the feed delivery means.

Abstract: A monitor for detecting the relative velocity between a moving body or surface and a fixed body or surface includes a sensor having an actuator member, such as a wheel having magnetic pole pieces embedded therein and mounted for rotation proportional to the relative velocity between the two bodies or surfaces, and a pick-up member such as a coil or inductor, mounted adjacent the actuator for producing an electrical signal in response thereto. An electric circuit is connected to the pick-up member to receive the electrical signals therefrom and produce a plurality of indication signals in response thereto, including indication signals corresponding to the relative velocity being at or below one or more predetermined levels. The monitor also includes a plurality of indicators connected to the circuit and responsive to the indication signals therefrom, such as lights or audible alarms.

Abstract: A contact lens disinfector unit (10) includes a housing, heating means (20) within the housing and arranged to heat the contact lens case (21) and the contact lenses therein to a disinfecting temperature and for terminating the application of heat thereafter to allow the contact lenses to cool, and temperature indicating means (30) that includes a partially opaque viewing window (17) formed in the housing, a movable member (36) having a substantially planar surface (37) which includes temperature indicia corresponding to a "HOT" condition of the lens case, and a bi-metallic member (32) responsive to the temperature of the heating means (20) for moving the movable member planar surface toward and away from window (17) to indicate the "HOT" condition or a condition where the lens case is cool enough for handling.

Abstract: A soundboard for pianos is provided which is of laminated construction, comprising three plies. The top and bottom plies are of equal thickness and lie in planes parallel to one another. The grains of these plies are also parallel to one another. The center ply is of greater thickness than the sum of the outer plies, but of less thickness than twice the sum of the two outer plies. The grain of the center or core ply is at right angles to the grains of the two outer plies.

Abstract: A surge voltage arrester utilizes for surge protection a varistor of the zinc oxide type between a line terminal and a ground terminal. The varistor is of a type that has a resistance which decreases as increasing voltage is applied thereacross. With increasing temperature the leakage current through the varistor increases at a given voltage. At a critical temperature and voltage condition, the varistor is subject to a thermal runaway condition which would cause the varistor to fail expelling hot particles. To avoid this failure condition, a fail-safe mechanism is provided which connects the line terminal to the ground terminal by-passing the varistor when there is an overcurrent condition on the line that results in heating of the varistor.

Abstract: A recirculating animal waterer is disclosed. In one embodiment, the waterer includes a supply conduit which extends from a remote water source underground at a level below the frost line to a first junction located inside a waterer stand. A first nipple extends from that first junction and terminates outside the stand. A cross-over conduit extends from the first junction to a remote second junction, also located inside the waterer stand. A second nipple extends from that second junction to a point outside the stand. A return conduit extends from the second junction back to the first junction. This return conduit includes a heatable section. A heater is mounted adjacent the supply conduit heatable section. If desired, a thermostat can be located adjacent the second junction to provide intermittent heater operation. In another embodiment, additional nipples extend from the stand, and water conduits provide an endless, recirculating flow of water past each nipple.

Abstract: A microwave seed sensor produces an output signal in response to the passage of each seed through a seed planting tube or conduit forming a path of travel for seeds, as in a seed planting machine. The microwave seed sensor comprises a housing of predetermined dimensions defining a waveguide for supporting propagation of a standing wave pattern of predetermined order at a predetermined microwave frequency. The housing includes a tubular portion for receiving the seed conduit, so that the seed conduit and waveguide intersect to define a seed viewing area where the path of travel in the conduit is in registry with the waveguide. This seed viewing area is of predetermined dimension in the direction of the path of travel of seeds through the conduit for resolution of individual seeds by the microwave seed sensor so that seeds may be counted.

Abstract: A system is provided for developing a gating signal when a radio-frequency signal receiver is tuned to the center-frequency of a selected radio-frequency signal. The system comprises circuit means for tuning the receiver to a plurality of frequencies within a range of frequencies which includes the selected signal and for producing an intermediate frequency signal corresponding to the frequency to which the receiver is tuned. A frequency discriminator is coupled to the circuit means and is tuned to a predetermined frequency, with the frequency discriminator being responsive to the intermediate frequency signal for developing an output signal having a DC component which varies systematically in accordance with the deviation of the intermediate frequency signal from said predetermined frequency.

Abstract: Biosynthetic polymeric compositions containing polyacrylate polymer, humectants such as glycerol, proteinaceous material such as gelatin, and water are prepared. The compositions are suitable for treatment of burns or other wounds and may be applied directly or in the form of a prepared film. The film may include a strengthening nylon mesh matrix.

Abstract: A unit (10) for disinfecting contact lenses includes a housing, heating means (20) arranged to heat a contact lens case (21) and the contact lenses therein and means (30) for indicating the temperature condition (HOT or COLD) of the lens case. The temperature indicating means includes a viewing window (17) formed in the housing, a prismatic lens (38) within the housing and behind the viewing window, and pivotally mounted indicia (39) behind the prismatic lens that indicates if the lens case is cool enough to handle following the disinfecting heating cycle.

Abstract: A fuel supply system for use in a fluid bed furnace or the like of the type which includes a bed comprising a quantity of particles, which bed fluidizes in response to the flow of heated gases upwardly therethrough and a burner for burning a supplied fuel and providing the fluid bed with a sufficient gas mixture flow at an elevated temperature for heating and fluidizing the fluid bed.

Abstract: A contact lens disinfector unit (10) includes a housing, heating means arranged to heat the contact lenses and the associated lens case (21) to a disinfecting temperature and for thereafter terminating the application of heat to allow the contact lenses to cool, and temperature indicating means (30) for indicating if the lens case is cool enough for safe handling. The temperature indicating means includes a viewing window (17) having opaque portions (38) and transparent portions (37). The transparent portions are arranged to define a temperature indicia. The temperature indicator also includes a plate (35) which has indicia thereon corresponding to the temperature indicia and a surrounding opaque background. The plate is slidable with respect to the viewing window between two positions, one of which indicates that the lens case is too hot to handle, and the other of which indicates that the lens case is cool enough to handle.

Abstract: A contact lens disinfector unit (10) includes a housing having a top wall (15), a heating block (27) within the housing for heating the contact lens case (25) and the lenses therein, and a lens case receiving compartment (26) between the heating block and the top wall (15) having an opening in a side wall (18) of the housing for slidingly receiving the contact lens case. A lens case ejector (28) is slidingly mounted on the housing top wall (15) and includes an elongate member (57) extending into the lens case receiving compartment to provide a key for positioning the lens case base against the heating block. The ejector also forms a pusher (56) to engage the lens case. A barrier wall (27a) isolates the lens case compartment from a cavity (48a) in the housing that contains electrical circuitry. Springs (50) press the lens case against the heating block.

Abstract: A surge voltage arrester assembly comprises a primary gas tube surge arrester and an air gap secondary arrester that provides surge protection should the gas tube become vented to atmosphere. The secondary arrester has the air gap defined by a rim of one of the gas tube electrodes and a metallic cup into which the gas tube is positioned. In a three element version of the invention wherein the gas tube has two line electrodes and a ground electrode, metallic cups are provided at opposite ends of the gas tube to cooperate with the ground electrode for forming secondary air gaps for each line electrodes. An O-ring and a sealing compound seals each secondary air gap against the entrance of contaminants.