Kymograph, by C. F. Palmer, London, before 1934?

A vertical electrical kymograph used for recording temporal variations in any physiological process.

It consists basically of a revolving drum, to which a sheet of paper (usually smoked paper) would be attached. As the drum turns, a pen or signal marker moves up and down perpendicular to the motion of the drum, recording events. This kymograph is made of brushed brass painted green. It has an oval base and an oval housing for the motor. On one side of the housing are prongs to connect a power supply marked "A.C. 230 VOLTS 50 CYCLES". Above the housing, on a grooved rod, is the drum. Beneath the drum there is a lever which can be moved along a semicircle into groves on an arc marked "C.M. PER MINUTE". No signal marker or other writing apparatus is present. This instrument may have been used by William McDougall in Oxford c. 1904-1920.