An impulse electric motor for driving recording instruments

W. F. Joachim
naca-tn-157
September, 1923


The chief purpose in undertaking the development of this synchronous motor was the creation of a very small, compact power source, capable of driving the film drums of the recording aircraft instruments designed by the staff of the National Advisory Committee for Aeronautics.

An Adobe Acrobat (PDF) file of the entire report:
http://naca.central.cranfield.ac.uk/reports/1923/naca-tn-157.pdf