Reprint of 1900 Percival Marshall book explaining complete instructions for making electrical timepieces, synchronized clock systems, and chiming mechanisms. Chapters on various types of electric clocks, how to produce a seconds pendulum clock, using inexpensive materials, converting a grandfather clock to impulse drive, the sychronome system, and a master chiming gear for 1/2 minute electrical time circuits. Generously illustrated. Soft cover. 159 pages.

By Johannes Graf. Published in English by the German Clock Museum. 39 page, soft cover booklet describes how electricity and electronics have altered timekeeping over the past 150 years. Great historical record is profusely illustrated.