isible coil man Wheel Company, which exhibited every separate tion, on ‘‘ Earthquakes and Voleanic Disturbances,” detail of a modern Victor, as well as several finished brake, of which we give an illustration. The whole of the author stated that the chief feature of the lecture machines of great… … 3. Brown roller sprocket. 1. Detail view of cuil. 2. Connections between coil high speed porition. and han ile bar. THE JOHNSTON TWO SPEED GEAR. THE SPENCER INVISIBLE COIL BRAKE. earth rather than around its surface. This high velo- brake proper consists of a spiral coil of flat spring hub, turned…
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