The art of mechanical analog computing reached its zenith with the differential analyzer, built by H. L. Hazen and Vannevar Bush at MIT starting in 1927. This built on the mechanical integrators of James Thomson and the torque amplifiers invented by H. W. Nieman. A dozen of these devices were built before their obsolescence became obvious.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): The torque amplifiers of the differential analyzer were created by whom?
H. W. Nieman