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Claim 1

A FLUID OPERATED DIGITAL TO ANALOGUE CONVERTER COMPRISING, A TANK MEANS INCLUDING A FIRST INLET MEANS FOR RECEIVING A FIRST FLUID STREAM, A SECOND INLET MEANS FOR RECEIVING A SECOND FLUID STREAM AND AN EXHAUST MEANS, A FLUID AMPLIFYING MEANS CONNECTED TO SAID FIRST TANK INLET MEAN AND BIASED FOR DIVERTING SAID FIRST FLUID STREAM THEREFROM, SAID TANK EXHAUST MEANS INCLUDING A NORMALLY OPENED SWITCHING MEANS THROUGH WHICH SAID SECOND FLUID STREAM NORMALLY EXHAUSTS, SAID SECOND TANK INLET MEANS PASSING THROUGH FIRST AND SECOND RESTRICTION MEANS PRIOR TO ENTRY INTO SAID TANK, LOAD CONNECTION MEANS LOCATED BETWEEN SAID FIRST AND SECOND RESTRICTION MEANS, AND MEANS FOR APPLYING AN INPUT IN THE FORM OF A PULSED FLUID STREAM COMMONLY TO SAID FLUID AMPLIFYING MEANS AND SAID SWITCHING MEANS, WHEREBY AN INPUT PULSE FROM SAID PULSED FLUID STREAM DIVERTS SAID FIRST FLUID STREAM INTO SAID TANK MEANS AND OPERABLY CLOSES SAID NORMALLY OPENED SWITCHING MEANS WITHIN SAID TANK EXHAUST MEANS FOR INCREASING THE PRESSURE WITHIN SAID TANK MEANS AND APPLYING SAID PRESSURE TO SAID LOAD CONNECTION MEANS AS AN ANALOGUE OUTPUT REPRESENTATION OF SAID PULSED FLUID STREAM INPUT.