Linkage for moment balancing measuring apparatus

Moment balancing measuring apparatus of the pneumatic type comprising:

• a first pivotally mounted lever;
• a pneumatic system including a bellows tube operatively associated with one end region of said first lever, first duct means adapted to be connected to a source of pressurized gas, a fixed nozzle in gluid communication with one end of said first duct means, second duct means fluidly intercommunicating said first duct means and said bellows tube, and third duct means in fluid communication with said second duct means;
• a second pivotally mounted lever having a flap member mounted thereon, said second lever being positioned such that said flap member is contiguous with said fixed nozzle, whereby upon a measuring force being applied to said second lever and said first duct means being connected to a source of pressurized gas, the position of said levers determines the position of said flap member relative to said fixed nozzle thereby resulting in a certain pressure building up in said nozzle member which is transmitted to said first lever through said second duct means and bellows tube as a pneumatic force;
• and
• means for adjustably varying the ratio of the pneumatic force to the measuring force including a rod-like member having one end rotatably attached to said first lever and locking means for selectively securing said rod-like member to said second lever of the linkage in a particular position with respect to said second lever corresponding to a particular instance of measurement.