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> Vintage 1920's hopkins magneto generator electric tach
Vintage 1920's hopkins magneto generator electric tach
The sphere was driven through the shaft D by a high-speed motor, whose axle was connected at one end to a- Hopkins electric tachometer, for the purpose of ...
link.aps.org/doi/10.1103/PhysRev.19.38 - Similar pages
©1922 The American Physical Society
