(under subclass 321) Apparatus in which the motor has a movable working member adapted to receive energy from an unconfined body of fluid, such as the wind or a river current.
(1) Note. Apparatus under this definition is limited to those devices in which motive fluid for the working member is completely nonconfined. Apparatus having stationary means for directing the flow of motive to the motor working member (e.g., trough, baffles, etc.) is thereby excluded under this definition.
