Abstract: A multi-range, accuracy enhancing sight system for the archery bow comprising a vertical array of micro-telescopic or restricted-field direct-view collimator sights mounted so that both the field of each sight and the position of the parallax-free fiducial reference of each sight within the field are independently adjustable in the horizontal and vertical directions. In a preferred embodiment each sight is affixed to an elongated bridge member adjustably supported in both the vertical and horizontal directions at each end from threaded support rods affixed thereto. Nuts clamp the threaded support rods in corresponding vertically extending slots provided in a support member attached to the bow. Interaction between opposing supports facilitates, in a simple and convenient manner, the fine incremental adjustment capability required for the system to perform well. Alternative embodiments increase the isolation between adjustments and provide for vernier vertical adjustment.

Abstract: A suspended-line-and-clock trail monitor improved (1) by anchoring the monitor-end of the trip-line in such a manner that when a crossing animal increases line tension beyond a predetermined threshold, stored line pays out to and is carried by the animal, thereby recording its precise path and direction of travel across a line of almost any length and (2) by introducing a resettable, lightly triggered actuator between the line and the clock thereby providing reliable operation from a mass-produced, low-cost, general-purpose digital clock in place of the usual stop watch, even with a line of light sewing thread. Such thread cost effectively combines sufficient line length for long runs with good portability.

Abstract: A multi-function sensor for internal combustion piston engines is disclosed comprised of a sensor plug extending into an engine cooling system passage adjacent the engine cylinder and providing output signals corresponding to the engine coolant temperature, as well as pressure signals created by combustion within the engine cylinders. The sensor plug comprises a threaded cylinder having an internal open ended bore, closed off with a thin metallic sealing disc on which is bonded a piezoelectric crystal layer detecting acoustical pressure waves transmitted into the water jacket from the engine cylinders upon ignition. A disc of thermistor material is bonded atop the piezoelectric crystal to provide electrical signals corresponding to coolant temperature.

Abstract: An improved dual mode display optimized for image contrast in both the active and passive modes is described herein. The dual mode display comprises two tandemly disposed light valves in which a semi-transparent reflective surface disposed behind the first light valve display reflects incident light in the passive mode and transmits light from a back illuminating light source in the active mode. The optical density of the electro-responsive material in the first light valve is selected to optimize the image contrast of the image formed by reflected incident light and the optical density of the electro-responsive material of the second light valve cooperates with the electro-responsive material of the first light valve to optimize the contrast of the transmitted image in the active mode of operation.

Abstract: A light valve is formed of a plurality of spherical dipolar particles suspended in a matrix material. Each spherical dipolar particle has a unified body formed in three discrete symmetrical sections. A central section is configured to permit light transmission when in a first orientation with respect to a path of light travel, and generally not permit light transmission when in a second, transverse orientation with respect to the path of light travel. A pair of intermediate sections bound the central section and are formed of a transparent material having an electrical permittivity that varies through a range of values as a function of the frequency of an applied electric field. A pair of outer sections bounds the intermediate sections and are formed of a material having a relatively stable electrical permittivity within the range of values of the intermediate sections.

Abstract: A passive electro-optical collision avoidance system disposed within a moving vehicle for generating a collision avoidance signal. The system comprises a lens, image sensor and image processor wherein the image processor generates a collision avoidance signal in response to the size of the image and its rate of growth.

Abstract: A colloidal light valve having enhanced image contrast is disclosed. The colloidal light valve has a diffusely transmissive front window and a specially reflective surface on the rear substrate. A thin colloidal suspension of dichroic particles disposed between the window and the rear substrate is operative to change its optical density in the presence of an electrostatic field. In the preferred embodiment, transparent electrodes are disposed on the inner surface of the front window permitting an electrostatic field to be applied across the colloidal suspension in the regions immediately underlying the electrodes. The electrodes are arranged in the familiar multi-element bar pattern capable of forming alpha numerical characters.