Accelerometer

Claim 1

A TWO AXIS LINEAR ACCELEROMETER COMPRISING; HOUSING MEANS, SAID HOUSING MEANS HAVING A CAVITY THEREIN SYMMETRICAL ABOUT AN AXIS; A PLANE SURFACE ON SAID HOUSING MEANS PERPENDICULAR TO SAID AXIS FORMING ONE END OF SAID CAVITY; A FLUID EXHAUST PASSAGE WITHIN SAID HOUSING MEANS IN COMMUNICATION WITH SAID CAVITY; A FLUID SUPPLY PASSAGE WITHIN SAID HOUSING MEANS IN COMMUNICATION WITH SAID CAVITY; SPHERICAL SEISMIC MASS MEANS LOOSELY RECEIVED WITHIN SAID CAVITY; MEANS INCLUDING SAID SUPPLY PASSAGE AND SAID EXHAUST PASSAGE FOR PROVIDING A CONTINUOUS FLOW OF A FLUID THROUGH SAID CAVITY SUBSTANTIALLY ALONG SAID AXIS, SAID CONTINUOUS FLOW OF FLUID BEING EFFECTIVE TO AXIALLY POSITION SAID SEISMIC MASS MEANS IN ENGAGEMENT WITH SAID PLANE SURFACE, SAID CONTINUOUS FLOW OF FLUID FURTHER BEING EFFECTIVE TO RADIALLY CENTER SAID SEISMIC MASS MEANS WITHIN SAID CAVITY IN A NORMAL POSITION RELATIVE TO SAID HOUSING MEANS, SAID SEISMIC MASS MEANS BEING DISPLACED FROM SAID NORMAL POSITION UPON ACCELERATION OF SAID HOUSING MEANS PERPENDICULAR TO SAID AXIS; AND READOUT MEANS INCLUDING A PLURALITY OF PRESSURE SENSING PORTS WITHIN SAID HOUSING MEANS PERPENDICULAR TO SAID AXIS AND ANGULARLY SPACED THEREABOUT, SAID PRESSURE SENSING PORTS BEING CONTIGUOUS SAID SEISMIC MASS MEANS, THE PRESSURE WITHIN EACH PRESSURE SENSING PORT BEING INDICATIVE OF THE DISTANCE BETWEEN SAID HOUSING MEANS AND SAID SEISMIC MASS MEANS, SAID READOUT MEANS INCLUDING MEANS FOR COMPARING THE PRESSURE WITHIN EACH PRESSURE PORT SO AS TO PROVIDE A SIGNAL INDICATIVE OF THE MAGNITUDE AND DIRECTION OF AN APPLIED ACCELERATION.