Fluid meter

Claim 1

IN A FLUID METER, A CONDUIT CONVEYING A GAS TO BE MEASURED, BY-PASS MEANS INTERCEPTING A PART OF THE GAS INTHE CONDUIT AT ONE POINT AND RETURNING THE GAS TO ANOTHER POINT DOWSTREAM, A TURBINE ROTATABLE OVER TWO SIMILAR RANGE OF VELOCITY AT HIGH AND LOW GAS FLOW RATES IN SAID CONDUIT, THE BY-PASS MEANS CONVEYING GAS TO THE TUBINE, A BAFFLE MEANS INCLUDING A BAFFLE AND A PIVOTAL MOUNTING THEREFOR LOCATED IN THE CONDUIT AT THE SAID ANOTHER POINT, THE BAFFLE MEANS INCLUDING A SNAP-OVER MECHANISM WHEREBY THE BAFFLE ASSUMES AN OPEN POSITION OF A SUBSTANTIALLY FULL-CLOSED POSITION UPSTREAM OF SAID ANOTHER POINT, SAID SNAP-OVER MECHANISM INCLUDING A RESILIENT HOLDING MEANS CONNECTED BY A LEVER OF VARIABLE EFFECTIVE LENGTH TO THE BAFFLE TO HOLD THE BAFFLE IN THE SUBSTANTIALLY FULLY CLOSED POSITION AT THE LOW GAS FLOW RATES IN THE CONDUIT, THE BAFFLE BEING MOUNTED ECCENTRICALLY ON THE PIVOTAL MOUNTING SO THAT GAS FLOWING IN THE CONDUIT EXERTS A TURNING FORCE ON THE BAFFLE OPPOSING THE RESILIENT HOLDING MEANS SUCH THAT ON REACHING A PREDETERMINED GAS FLOW THE FORCE APPLIED THEREBY ON THE BAFFLE EXCEEDS THE FORCE OF THE RESILIENT MEANS AND SNAP ACTION TO OPEN POSITION OCCURS, THE GAS FLOW THROUGH THE BY-PASS MEANS VARYING WITH THE BAFFLE POSITION, A REGISTER CONNECTED TO THE TURBINE TO INTEGRATE