Position indicating device

Claim 1

A POSITION INDICATING DEVICE COMPRISING: (A) A DISHED MEMBER HAVING A CONCAVE LOWER SURFACE; (B) A PHOTOCELL ARRAY CONSTITUTED OF THREE PHOTOCELLS DISPOSED ADJACENT SAID CONCAVE SURFACE AND POSITIONED SYMMETRICALLY OF THE CENTER THEREOF; (C) AN OPAQUE FLUID POSITIONED WITHIN SAID DISHED MEMBER EXTENDING SYMMETRICALLY OF THE CENTER OF THE CONCAVE SURFACE THEREOF WHEN THE DISHED MEMBER IS POSITIONED HORIZONTALLY, THE OPAQUE FLUID MOVING TO BLOCK A LARGER AREA OF ONE OF SAID THREE PHOTOCELLS THAN OF ANOTHER OF SAID CELLS WHEN THE DISHED MEMBER MOVES OUT OF THE HORIZONTAL POSITION; (D) A PAIR OF TERMINAL CONNECTED TO EACH OF SAID PHOTOCELLS, A FIRST TERMINAL OF EACH OF SAID PAIRS BEING ELECTRICALLY INTERCONNECTED; (E) A SERVO GENERATOR HAVING A THREE PHASE STATOR AND A SINGLE PHASE ROTOR ENERGIZED BY SAID STATOR, THE STATOR WINDINGS BEING ELECTRICALLY CONNECTED TO THE SECOND TERMINALS OF THE RESPECTIVE PAIRS OF TERMINALS; AND (F) AN INDICATOR MENS MECHANICALLY CONNECTED TO SAID ROTOR AND BEING ACTUATED THEREBY.