(under subclass 472) Apparatus in which there is provided a reaction member in common operative engagement with said plural piston or cylinders for converting the relative reciprocatory motion between the pistons and cylinders to or from continuous rotary motion of a drive element, there being provided resilient means for biasing said reaction member to a position causing said motion conversion, said reaction member being directly responsive to fluid pressure within the plural expansible chambers for movement in opposition to the resilient bias thereon for varying the extent of relative reciprocation between said piston and cylinders.
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473, for control of the drive means by means which includes a separate sensing means (i.e., not directly responsive to pressure in the working chamber) which responds to a condition (e.g., input or output pressure) of the device.