The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . ESCAPE-WHEEL ANDFORK. MACHINE-MADE WATCHES. 343 escape-wheel escapes. On the periphery of the balance-wheel will be observed a number of small screws. Theseare useful in regulating the watch to temperature. At Fig. DIAGRAM OF THE PKINCIPAL PAKTS OF A WALTHAM WATCH. Fig. 83 will be seen a balance-wheel arranged with what iscalled the compensation balance, which was invented morethan a hundred years ago. It will be observed that therim is cut in two parts, which are maintained in po
The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . ESCAPE-WHEEL ANDFORK. MACHINE-MADE WATCHES. 343 escape-wheel escapes. On the periphery of the balance-wheel will be observed a number of small screws. Theseare useful in regulating the watch to temperature. At Fig. DIAGRAM OF THE PKINCIPAL PAKTS OF A WALTHAM WATCH. Fig. 83 will be seen a balance-wheel arranged with what iscalled the compensation balance, which was invented morethan a hundred years ago. It will be observed that therim is cut in two parts, which are maintained in positionby a The black part of the rim is made ofsteel, the lighter part of brass, and being firmly fastenedtogether a result is obtained that causes the balance tomaintain the same speed whether the temperature is hot orcold. As the usual vibration of a balance-wheel is at therate of eighteen thousand an hour, it can be seen that aslight expansion of the rim by heat would slow down thewatch materially, while exposure to cold would make it 28* 344 WONDERS OF MODERN MECHANISM. ruu fast. In the compensation balance, however, the brassexpands faster than the steel, and tends to make the rimcurl in with an increase of temperature, so that when it ishot the watch is inclined to run fast instead of slow, whichwoul
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