Description

Black and white photograph of Ronald A. Pasqualini operating a large slide rule.

Original caption: "Ronald Pasqualini, 1962, of Brooklyn, and Philip F. Hudock, 1962, of Hazelton, Pa., were this year's biggest slide-rule operators at M.I.T. Remote drives which can precisely position some large object are widely used for machine tools, radar antennas, and other industrial and military equipment. Pasqualini and Hudock learned about feed-back positioning systems by building one for a rule big enough to be seen from the rear of a lecture hall. Motors and chain drives concealed behind it move the slide and the cursor to positions corresponding to those on the small rule in the foreground. The builders reported position accuracy of 1/16th of and inch on the large rule. Pasqualini is shown adjusting the speed and response of the cursor drive system."

Used in: Technology Review, March 1962, p. 22.