Abstract: A propulsion and exercise device for attaching to a conventional wheelchair having: at least one drive wheel operably interposed between the rear set of wheelchair wheels. A telescoping mast may connect the drive wheel axle to pedals to permit the pedals to be selectively moved from a stowed position to an extended position for use. Power is transmitted from the pedals to the drive wheel through a chain drive that passes over idler sprockets that maintain the chain length during adjustment of the telescoping mast.

Abstract: A caloric testing technique and apparatus for evaluating vestibular ear disorders by independently stimulating the left and right lateral canal receptor organs, using heated and cold air, and measuring the responses in order to obtain an indication of disordered vestibular function. Timed irrigation periods are employed, the periods being adjustable so as to control the magnitudes of the caloric stimulations, and the measurements of responses are made by the electrical recording of eye movements for accurate measurement of nystagmic response intensity.