Mechanical device

Claim 1

IN A GAS FLOW DETECTOR FOR LOCATION BETWEEN A SOURCE OF GAS UNDER PRESSURE AND A SYSTEM TO BE FED THEREBY, THE COMBINATION COMPRISING: INDICATING MEANS; INLET MEANS CONNECTED TO SAID SOURCE AND OUTLET MEANS CONNECTED TO SAID SYSTEM; VALVE MEANS CONNECTED BETWEEN SAID INLET AND OUTLET MEANS HAVING AT LEAST FIRST AND SECOND SELECTABLE POSITIONS, WHEREBY SAID VALVE MEANS IN ITS SAID FIRST POSITION DIRECTLY CONNECTS SAID INLET MEANS IN ITS SAID FIRST LET MEANS AND IN ITS SAID SECOND POSITION CONNECTS SAID INLET MEANS WITH SAID OUTLET MEANS THROUGH SAID INDICATING MEANS; SAID INDICATING MEANS COMPRISING A CLOSED CHAMBER HAVING WALLS AT LEAST PARTIALLY TRANSPARENT AND BEING PARTIALLY FILLED WITH LIQUID; A TUBE EXTENDING FROM SAID VALVE MEANS INTO SAID LIQUID; AND PASSAGE MEANS COMMUNICATING FROM SAID VALVE MEANS WITH SAID CHAMBER BUT BEING SPACED FROM SAID LIQUID; WHEREBY GAS FROM SAID SOURCE MAY BE DIVERTED BY SAID VALVE MEANS WHEN SAME IS IN ITS SAID SECOND POSITION INTO SAID TUBE AND WHEREBY ALSO SAID PASSAGE MEANS IS THEN CONNECTED BY SAID VALVE MEANS TO SAID SYSTEM SO THAT GAS FLOWING FROM SAID SOURCE TO SAID SYSTEM WILL BUBBLE THROUGH SAID LIQUID.