Description

Labeled photograph of the 20-foot steamship model, used by Frank M. Lewis to measure vibration. Original caption: "The Ship Shaking. The 20-foot model of a modern steamship which Professor Frank Lewis used in his studies of vibration (see below). A shows the motor and propeller gearbox, while B is the calibrator served by the oscillograph, F. The control switchboard is at C, the amplifier at E, and the vibration pickup at D". Used in: Technology Review, Research Reports. v. 3, no. 4, Feb, 1938"