This interesting text covers the work in penduluum and plate vibrations, harmonographs, vortex plates, synchronous penduluums, geometric pen, synchronous springs, Benham's Triple Penduluum, sympathetic oscillations and harmonic vibrations. It further covers hardware construction, function and operation and has a number of beautiful harmonograph drawings nearly identical to pendulograph images. Reprint of the original 1909 text. Wire bound 8.5" x 11"