The Zyntrax Corporation

Westinghouse Electric Corporation

Gregory J Walz

Edward A Woloshuk

Richard S Rhoton

Robert O Kretzschmar

An apparatus and method for providing a control signal in front of a vehicle moving along a track having an earth ground potential, with the vehicle having first and second low impedance interconnected collector shoes being coupled between a pair of signal rails and provided at respectively the front end and rear end of the vehicle. A first control signal is provided in front of the vehicle to control the desired operation of the vehicle and a second control signal is provided in the rear of the vehicle to control an undesired operation of the vehicle. An impedance member is provided, in a first conductive circuit on the vehicle or in a second conductive circuit associated with the track, to prevent the second control signal in front of the train from having a threshold level high enough to confuse the desired operation of the train.

Transit vehicle signal apparatus and method

Three-dimensional plural display apparatus

This invention utilizes a series of two-dimensional photographs of successive cross-sections of an object. The photographs are arranged on a film strip in the order in which the successive sections appear in the object. The film strip is transparent and is intermittently illuminated as the successive frames of the film strip move across an optical path. A projection screen in the optical path is moved with respect to the optical path so that as each successive photograph is illuminated, that photograph is projected onto the screen at a successive position and so that each photograph as projected on the screen appears more remote from an observer than the preceding one. Thus there is formed on the screen a series of images which appear to an observer having persistence of vision to be a composite three-dimensional imgage. The illuminating means may omit the illumination of certain photographs of the series, so that only selected photographs are reproduced on the screen. An optical mask may also be used to block certain portions of the projected photographs. A changeable film holder is provided for retaining the film strip and protecting it.

Growing community of inventors

Pittsburgh, PA, United States of America

Gregory J Walz