Pressure differental indicating system for fluid flow

Claim 1

A PRESSURE DIFFERENTIAL MEASURING DEVICE COMPRISING: A FRAME HAVING A PAIR OF PRESSURE CHAMBERS; A RECIPROCABLY MOUNTED ROD, EXTENDING INTO EACH OF THE CHAMBERS; EXPANSIBLE AND COLLAPSIBLE DIAPHRAGM MEANS, IN EACH CHAMBER, FIXED ADJACENT EACH END OF THE ROD FOR RECIPROCATING THE ROD IN PROPORTION TO THE MAGNITUDE OF THE PRESSURE DIFFERENTIAL BETWEEN THE CHAMBERS; A PLURALITY OF ROTATABLE POINTERS OF VARYING SCALE FOR INDICATING THE PRESSURE DIFFERENTIAL SENSED BY THE DIAPHRAGM MEANS; AND AN INDIVIDUAL MOTION TRANSMITTING LINKAGE FOR EACH POINTER SEPARATELY AND UNRELATEDLY CONNECTING THE ROD TO EACH POINTER FOR TRANSLATING THE RECIPROCABLE MOVEMENT OF THE ROD INTO VARYING DEGREES OF ROTARY MOVEMENT OF EACH POINTER, THE MOTION TRANSMITTING LINKAGE OF EACH POINTER BEING INDEPENDENT FROM EVERY OTHER MOTION TRANSMITTING LINKAGE.