Anonymous, All the Answers at Your Fingertips; in the Laboratory of M.I.T., Popular Mechanics, vol. 85, Mar. 1946, pp. 164-167 ...
A differential analyzer was built at the Moore School of Electrical Engineering:
Travis, Irven, Differential Analyzer Eliminates Brain Fag, Machine Design, July 1935, pp. 15-18.
A differential analyzer was built at the General Electric Company, Schenectady, N. Y. Instead of using a mechanical or electrical amplifier of the motion of the little turning wheel riding on the disc, this machine follows the motion using polarized light. This machine is described in:
Berry, T. M., Polarized Light Servo System, Transactions of the American Institute of Electrical Engineers, vol. 63, Apr. 1944, pp. 195-197.
Kuehni, H. P., and H. A. Peterson, A New Differential Analyzer, Transactions of the American Institute of Electrical Engineers, vol. 63, May 1944, pp. 221-227.
A differential analyzer has been put into use at the University of California:
Boelter, L. M. K., and others, The Differential Analyzer of the University of California, Los Angeles: University of California, 1947, 25 pp.
A differential analyzer was built at Manchester University, England. It was built first from “Meccano” parts, at a total cost of about 20 pounds, and later refined for more exact work. Some articles dealing with this differential analyzer are:
Hartree, D. R., The Differential Analyzer, Nature, vol. 135, June 8, 1935, p. 940.