Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 43
a compensating pendulum. One kind of compensating pendulum isshown in Figure 20. The dark lines repre-sent rods which are made of brass, while theother ones representrods of steel. Bylooking at the figureyou will see that thesteel rods make thependulum longerwhen they expand,and the brass rodsmake… … BALANCE WHEEL OF A WATCH 33 13 keeps the pendulum at the same length, regardless of thetemperature. Another method of accomplishing the samething is shown in Figure 21. The pendulum has a cup at thebottom, containing mercury. As thetemperature rises, the rod of thependulum becomes longer; but at…
Physics
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