Dual Tracking Task Apparatus, Probably by C. F. Palmer, London, c. 1930

This electrical instrument was used in psychology laboratories to perform tests on eye-hand coordination. It is a lacquered wood box with brass joints. Inside the box is gearwork mounted on a platform that rolls along two rods that run the length of the box. This gearwork is powered by an electrical unit attached to the outside of the box, and there is a toggle switch next to the unit. Half of the box top swings open to reveal the gearbox and a lever setting marked in inches and labeled "FAST 78 SLOW". There is a smaller hinged lid on the other half of the box top that reveals a white circle divided into quadrants and set in a square frame. This can be moved horizontally by a crank handle extending from the top of the box and vertically from a knob slider on the side of the box.

This instrument was used at the IEP c. 1930-1950 and the acquisition information states that it was made by C.F. Palmer.