A device for preventing trailers hitched to passenger automobiles or tractors from swaying under the influence of lateral forces commonly encountered during relatively high speed straight line travel on highways. The device comprises a flat plate having a groove that faces and is engaged by a detent. The plate and the detent are mounted to the towing vehicle and the trailer and they are biased towards each other so that a torque of a predetermined magnitude is necessary to disengage the detent a...

A circuit for generating signals in the audio frequency range which signals contain effective parts of animal calls. Because the signals are of relatively narrow bandwidth, the apparatus is uncomplex.

A device for limiting the higher frequency energy of an audiofrequency spectrum being delivered to a magnetic tape recording device in which the full spectrum is amplified and the output of the amplifier is sensed to determine when the higher frequency energy is above a predetermined limit to provide a feedback signal which operates a shunt in the amplifying circuit to attenuate only the higher frequencies of the audiofrequency spectrum to maintain the higher frequencies at the output of the amp...

A longitudinal indicia bearing scroll having an arbitrarily determined sequence of cards distributed in rows and columns. Opaque sliders are provided so that cards indicated in any row can be revealed sequentially. Slide assemblies are provided to reveal a subsequent or prior row of cards in a column without disturbing any adjacent column. The scroll is mounted on a mechanism which supports the scroll and permits movement of the scroll in the longitudinal direction for positioning of the rows. O...

Electronic components are constructed from a solid spherical core of electrically nonconducting material such as a stabilized crosslinked copolymer plastic. The spherical core is coated with a plurality of concentric electrically functional layers to provide a variety of electronic components such as resistors and capacitors having pressure sensitive electrical characteristics. More complex electronic components such as transistors, thermistors, rectifiers and thermocouples may be provided depen...

A labyrinth puzzle provided with a single inlet designed to receive and retain a marble. The labyrinth includes at least one T-shaped passage formed by first and second channels, the second channel intercepting the first channel intermediately. The first channel forms the arms of the T, one arm being provided with a throwing station and the other arm having a trap at its end. The second channel or leg portion of the T defines at its end the marble destination. The marble in the labyrinth is thro...

Apparatus for counting, displaying and storing numerical data such as numbers of discrete items and linear distances. The data relating in various items and distances can be stored in respective memory locations for subsequent readout. The apparatus can be preset to count forwardly from a predetermined number and can provide the data input for other data handling equipment, such as a computer.

An optical stabilizer consisting of at least one neutrally buoyant lens supported in a transparent fluid bath along the optical path of a lens system. The fluid bath is enclosed within a casing, the casing being transparent at the points where it intercepts the optic path. The bath is provided with a circuitous path and its inertia moves the lens across the optical path to deflect the light passing through the lens equal and opposite to the accidental angular motion of a lens system.

An arc furnace having a rotating electrode wheel that is rotated in a direction opposite from the direction of arc rotation caused by the magnetic field produced by the arc discharge. In this manner, the electrode wheel and arc will rotate in opposite directions to insure that the arc will originate from continually changing regions on the electrode wheel. According to a second embodiment, an electromagnet is disposed around the crucible and may be suitably energized to either produce stationery...

An electrostatic line printer incorporating a multilayered particle modulator comprising a layer of insulating material, a continuous layer of conducting material on one side of the insulating layer and a segmented layer of conducting material on the other side of the insulating layer. At least one row of apertures is formed through the multilayered particle modulator. Each segment of the segmented layer of conductive material is formed around a portion of an aperture and is insulatively isolate...