Abstract: A photocopying machine is provided with a repeat mechanism. After the original material to be copied has left the exposure station a feed mechanism is provided by optionally returning the original material to the exposure station for making of a second copy. Two return mechanism paths are provided for originals of different length.

Abstract: An automatic control system is provided for regulating the emission of an X-ray tube of the type which is activated by the heating of a cathode filament by passing current through the filament, and which emits X-ray radiation systematically in accordance with the amount of tube current flowing between the anode and cathode of the tube, with a relatively high voltage being applied between the anode and cathode. Current is passed through the filament and a tube current sensor is coupled to the X-ray tube for developing a tube current signal representative of the magnitude of the current flowing between the cathode and anode of the X-ray tube. Coupled to the current sensing circuit and responsive to the tube current signal is a circuit for generating a filament current control signal.

Abstract: A duct for use with mine equipment is provided with an elongate aperture normally closed by a displaceable sealing means to retain a fluid, under pressure, within the duct, the sealing means, in use, being displaceable by fluid pick-up means carried by a mining machine to convey fluid from the duct to the machine. The invention also includes conveyor trough section provided with such a duct and a mining machine combination.

Abstract: A brake system for a towing vehicle and trailer is disclosed. An electromechanical transducer controller connected to the towing vehicle brake system develops an electrical signal which varies continuously and systematically in accordance with braking action pressure in the towing vehicle brake system. In a fluid trailer brake system, an electromechanical control receives this signal, and continuously and systematically varies the fluid pressure in the trailer brake system accordingly. A vacuum or other fluid power booster can be included to assist in amplifying and applying this fluid brake pressure. Trailer braking action in caliper-type trailer disc brakes varies in accordance with this fluid pressure.

Abstract: A feeder pan assembly is provided for use with poultry and the like. A hood includes a shell which extends into a pan to define an annular feeding area accessible to the poultry. A hood-pan interconnector includes a number of supports which are curved and inclined to slide over a corresponding number of ramps formed upon the shell. When the hood and interconnectors are relatively rotated, the interconnector supports slide over the ramps to raise or lower the pan. This pan position readjustment increases or decreases the amount of feed flowing into the feeder pan assembly feeding area.

Abstract: A plant water trough is disclosed for providing a humid atmosphere in the immediate vicinity of a potted plant. The trough comprises an upstanding, endless, relatively tall inner wall which defines an enclosed space of a size and shape to accommodate an individual flower pot of common size. The trough further includes a relatively low outer wall radially extending outside the flower pot rim so as to permit water in the trough to evaporate and the humid atmosphere thus created to flow directly upwardly around the flower pot to the plant foliage.

Abstract: An electrical jack for telephones or the like is disclosed. The jack includes a box-like cover in which a number of bi-ended wires are mounted. Each wire terminates at one end in a spring contact adapted and located for engagement with a screw connector carried on a terminal block. At its other end, each wire terminates in a resilient folded spring contact. A clip member receives and mounts these folded spring contacts in a fixed, electrically spaced apart relationship. The clip is carried in the cover in such a location as to form part of a socket adapted to receive a multi-wire electrical plug.

Abstract: A tone-generating system for an electronic musical instrument of the percussion type is provided wherein an audible tone closely approximating the corresponding tone of a conventional instrument is generated electronically. A single-pole, double-throw switch is actuated by a key to initiate generation of the tone and a tri-level detecting circuit coupled to the switch is utilized to determine which of the three states the switch is in; that is, the two "throws" or positions of the switch which correspond to the released and depressed positions of the key, and the state in which the switch is between the other two positions. By detecting the three states and developing corresponding control signals, counting circuitry may be utilized to determine the intensity with which the key is depressed to enable generation by a read-only memory of digital scaling signals representative of the variations in amplitude of the initiated tone with respect to the intensity with which the key is depressed.

Abstract: The embodiment of the invention disclosed herein is directed to a monitoring system for detecting variations in the flow of a fluid through a passage such as an air duct associated with a cotton picker or other harvesting machine. Air flow sensing means is provided for mounting in the air duct to provide a first signal condition in response to the flow of air above a predetermined minimum level and a second signal condition in response to the flow of air below the predetermined minimum level. The air flow sensing means is coupled to an indicator means which attracts the attention of the harvesting machine operator and indicates which one, of a plurality of air ducts, is malfunctioning.

Abstract: A multiphase, full wave rectifier assembly comprises a first plate which carries a first set of diodes thereon, and a second plate which carries a second set of diodes thereon, the first and second plates being mutually isolated by an electrically insulating layer. Cathode terminals of the diodes of the first set extend with clearance through respective apertures in the second plate, and an electrical connector connects each of these cathode terminals to the anode terminal of a respective diode of the second set, said electrical connector being connectible to one of said phases to be rectified in use. A third set of diodes is carried by an electrically insulating body, one terminal of each diode of the third set being electrically connected to a respective one of the connectors, the other terminals of the diodes of the third set being connected to a common connector.

Abstract: A vacuum device for performing medical procedures such as a curettage, or the like. The device includes basically an evacuated vessel, a cannula or some other form of medical implement, and a valve arrangement for selectively applying the vacuum to the cannula. The present disclosure deals specifically with a novel valve arrangement for the device and various vacuum indicators that can be employed to provide a visual indication as to the presence of a vacuum within the vessel.

Abstract: A molded, plastic, hollow electrical connection box is disclosed. To support itself in a wall panel opening, the box includes stop ears formed at each end wall corner which extend perpendicularly to the end wall. Cooperating, mediately located cam segments of trapezoidal shape originally extend diagonally outwardly in planar configuration from the box end walls. After passing the panel during box insertion installation, the cam segments are permanently, rotatably deformed into positions extending generally parallel to the box end walls. In these positions, they permanently and compressively engage the supporting wall panel.

Abstract: There is disclosed a novel electrode assembly or package for two or more electrode devices, and also a novel method of fabricating not only the overall assembly, but also the devices in conjunction therewith. The electrode assembly as contemplated by the disclosure includes a carrier member in generally strip form having one or more openings therein, the number of said openings depending upon and being equal to one-half of the number of electrode devices to be employed in said assembly. A medical electrode device is secured in overlying relation to each opening, on opposite sides of the carrier member, with the gel pads of each said electrode device being disposed within the periphery of the opening and in face-to-face contact with the pad of the opposed electrode device. The electrode devices may be pre-gelled, if desired. It is contemplated that the assembly may then be packaged in a suitable container, such as a plastic or foil envelope.

Abstract: Cage structure for poultry and the like comprises a number of cage rows mounted on A-frames in pyramided, stepped back, A-shaped, elevational array. Each cage row includes a bottom/back member and a top/front member joined together to form a row of cages of rectangular cross section. Each cage row is tipped forward to incline the cage bottom so as to urge eggs laid in the cages to roll forward into an egg collecting trough at the cage front. The bottom element of the bottom/back member forms at least a portion of the top of the cage row next below. A feeder trough forms a portion of each cage front.

Abstract: A slit image is projected through the optical device being measured and onto the optical input screen of a variable-gain photomultiplier tube. Before it is incident upon the input screen of the tube, the projected image is modulated to develop simultaneously a low-frequency image component and one or more higher-frequency image components. Electronic filters are employed to separate the electrical output signal of the photomultiplier tube into discrete electrical signals each representative of a different one of the image components, and one or more meters are used to indicate the relative amplitudes thereof. A phase-locked-loop detector and an amplifier are employed between each filter and meter to improve the signal-to-noise ratio of the system and increase the signal amplitude to a level suitable for driving the meter. In one embodiment, the overall gain of the system is manually adjusted until the meter reads 100 percent MTF for the low-frequency component.

Abstract: A terminal block comprises clip type terminals which snap fit into the block and project outwardly from opposite faces of the block. The terminals are disposed in an array consisting of a number of rows and columns. At opposite margins of the terminal block are fanning strips for receiving the wires that are joined to the terminals. The block has recesses for the wires and the recesses are progressively deeper as they extend from the center of the block toward the fanning strips, thereby avoiding a buildup of conductors at the terminals that are adjacent to the fanning strips. The fanning strips also have resilient fingers that retain the wires in the various slots of the fanning strip.

Abstract: A drilling machine is disclosed for use in providing bolt holes in concrete stadium riser steps and the like. The drilling machine includes a relatively stationary base plate, and a foot plate slideable upon the base plate along a predetermined path. The foot plate carries drill mounting means for mounting a plurality of commercially available drills. An operating lever moves the foot plate, drill mounting device and drills toward and away from a vertical drilling face over the base plate.

Abstract: A system for measuring the amount of area traversed by a vehicular implement comprising linear distance measuring means for generating an electrical signal having a characteristic which varies systematically in accordance with the distance traversed by the implement. An electronic switch having a first switching state and a second switching state is utilized for developing a control signal having a first value when the switch is in the first state and a second value when the switch is in the second state, with the electronic switch being coupled to the electrical signal generator and responsive to the electrical signal for switching to the first switching state. A clock is responsive to the control signal being in the first state and having the first value for generating a timing signal having a predetermined frequency. A pair of presettable dividers are coupled to the clock for developing a switching signal which is applied to the electronic switch to switch it to the second switching state.

Abstract: As in prior testers, a capacitive cell in which material is placed to be tested is connected in a voltage divider circuit. However, signal generating means connected to the voltage divider applies voltages at different predetermined frequencies selected for the material being tested, and frequency selective means connected to the cell develop voltages at the applied frequencies having values dependent on the impedance of the filled cell at the respective frequencies. These voltages developed across the cell are applied to a computer that provides an output according to an equation that has been derived statistically from many samples of the material being tested for the substance or quality of the material being measured.

Abstract: A support mount is disclosed for journalling a roller or the like upon a wire basket or similar structure such as that offered in dishwashers and like appliances. The wire basket includes a bi-legged eyelet to which the mount is secured. The mount comprises an axle for rotatably carrying the roller and an axle extension. A backing plate formed at an end of the axle extension supports a plurality of arms adapted to embracibly engage the wire basket eyelet. A radially elongated backup skirt inhibits mount tipping.