Air pressure transducer

A transducer comprising an element embodying a part movable linearly in response to a change in pressure, a circuit comprising a plurality of resistances arranged in series including a common terminal and a bank of closely spaced terminals, a brush arm, means pivotally supporting the brush arm with its proximal end adjacent the common terminal and its distal end adjacent the bank of terminals for movement of its distal end along the bank of terminals, electrically connected brushes at the proximal and distal ends of the brush arm, said brushes having convex ends for tangential engagement with the terminals, the brush at the proximal end being yieldably held in constant rubbing engagement with the common terminal throughout movement of the brush arm and the brush at the distal end being yieldably held in rubbing engagement with the bank of terminals and being movable from terminal-to-terminal along the bank to add resistance to and remove resistance from the circuit, said brush at the distal end of the arm being narrower than the spaces between the terminals and being adapted by engagement with a terminal to complete a circuit to the common terminal and linkage operably connecting the linearly movable part of the element responsive to pressure to the proximal end of the brush arm for converting the linear movement of the pressure responsive part to rotational movement of the brush arm.