The new international encyclopaedia . Fig. 4. WATCH. 332 WATCH. called the fork, -which is attached to the action of the fork is controlled by the bal-ance-wheel by means of a little disk under thebalance-wheel called the roller. On the outeredge of this disk is the roller pin. which alter-nately engages and releases the fork. It has al-ready been shown that the action of the hair-spring on the balance makes its vibrations iso-chronous; by means of the fork disengaging atregular intervals the teeth of the escape wheelfrom the pallet and so freeing the whole train,this isochronous mo
The new international encyclopaedia . Fig. 4. WATCH. 332 WATCH. called the fork, -which is attached to the action of the fork is controlled by the bal-ance-wheel by means of a little disk under thebalance-wheel called the roller. On the outeredge of this disk is the roller pin. which alter-nately engages and releases the fork. It has al-ready been shown that the action of the hair-spring on the balance makes its vibrations iso-chronous; by means of the fork disengaging atregular intervals the teeth of the escape wheelfrom the pallet and so freeing the whole train,this isochronous motion is conveyed to the en-tire watch train. Fig. 4 of the accompanyingcuts shows the action of the fork, roller, rollerpin, pallet, and escape wheel, while Fig. 5 show3. ^-:ms^^ the hair-spring connected with the balance, withthe roller and roller pin underneath. Watch In England andSwitzerland watch-making was early developedas a household industry. Among the Swiss, inparticular, it gave employment to thousands ofmen, women, and children in their homes, the in-dustry being so far subdivided as to consist ofover a hundred distinct branches; and the Swissfinally became the watch-makers for the attempts, beginning as early as 1809,were made in the United States to make watchesby hand after the Swiss plan: but the price oflabor was too high and the laborers too inexperi-enced, so that each attempt ended in idea of manufacturing watches by using ma-chinery to make uniform and practically inter-changeable pieces, first occurred to Aaron Den-nison, a Boston watch-maker, about 1848. whowas familiar with the methods and machineryemployed for the manufacture of army mus-kets, at the Inited States Armory at Spring-field,
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