ferent compensat- until the first has made four revolutions. This shows ing pendulums. perfection, the vacuum method should be adhered to. oe 0 NEW ISOCHRONAL CLOCK. New Secondary Battery. There is some doubt as to when the first clock was A new type of secondary battery was employed on made, but… … latter part of October, when the temperature and four escapements arranged in pairs, as Fig. 3—THE AVERAGING WHEELS. quickly fell to 12° F. below zero. One curious shown in Fig. 2. Each pair of scape wheel arbors carry pinions, which engage in the effect of the cold was to bring down immense flocks…
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