Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 45
Figure 20.—A Compen-sating Pendulum withBrass and Steel Rods. Figure 21. — A Compen-sating Pendulum witha Mercury Well. watch what the pendulum is to aclock. If the wheel gets larger, thewatch runs more slowly; and viceversa. The rim of the wheel (Figure22) is made of two metals, steel andbrass,… … Figure 22. — Balance Wheel ofa Watch. the temperature rises and the spoke gets longer, the brass expands faster than the steel and makes the rim curve more, tending to make thewheel smaller. These twoeffects exactly counterbalanceeach other, and so the watchkeeps even time. 38. Hot Water…
Physics
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