Charles William Roach

US Patent:

43330665, Jun 1, 1982

Filed:

Jul 7, 1980

Appl. No.:

6/166652

Inventors:

Charles D. Roach - Newport News VA

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

H01H 3600

US Classification:

335206

Abstract:

An electrical transducer for indicating the position of an element movable n a predictable path, such as angular rotation, has no electrical parts on the movable element. A magnet mounted to the movable element traces a fixed path which lies adjacent to a stationary tubular enclosure containing liquid suspending a mass of ferromagnetic, electrically conductive material, the magnet drawing the mass of particles along within the tube on movement in its fixed path. Electrodes spaced on opposite sides of the tube wall along the length of the tube are electrically coupled by the mass of particles, whereby to indicate the position of the movable element.