. Time and its measurement . e the cir-cuit in an hour the next step was easy,by simply dividing the circle of quar-ters into sixty minutes. The old fel-lows who thought in hours must have the folint and verge escajiement, and insome early attempts to govern thefoliot a hogs bristle was used as aspring. r>3 ]jutting a ring around theends of the foliot and adding the hairspring of Dr. Hooke, about 1640, wehave the verge watches of our grand-fathers. This balance wheel and hairspring stand today, but the lever es-capement has taken the place of theverge. It is a modification of the deadbeat,
. Time and its measurement . e the cir-cuit in an hour the next step was easy,by simply dividing the circle of quar-ters into sixty minutes. The old fel-lows who thought in hours must have the folint and verge escajiement, and insome early attempts to govern thefoliot a hogs bristle was used as aspring. r>3 ]jutting a ring around theends of the foliot and adding the hairspring of Dr. Hooke, about 1640, wehave the verge watches of our grand-fathers. This balance wheel and hairspring stand today, but the lever es-capement has taken the place of theverge. It is a modification of the deadbeat, Fig. 29, by adding a lever to theanchor, and this lever is acted on bythe balance, hence the name leverwatch. All this you can see by open-ing your watch, so no detailed expla- TIME AND ITS MEASUREMENT 45 nation is necessary. Eii;ure 34 showstwo triple-cased Turkish watches withverce escapements, the one to the left Cromwell wurc an immense triple-case\,atch of this kind, and the poor plebe-ians who were permitted to examine. being shown partly opened in Fig. watch with its inner case, includ-ing the glass, is shown to the inner case is complete with twohinges and has a winding hole in theback. The upper case, of chasedwork, goes on next, and then the third,or outer case, covered with tortoiseshell fastened with silver rivets, goeson outside the other two. When allthree cases are opened and laid on thetable, they look like a heap of oystershells, but they go easily together,forming the grand and dignified watchshown to the left in Fig. 34. Oliver such a magnificent instrument werefavored! Our boys watches costing one dollarkeep much better time than this typeof watch. Comparing the Syrian 43, with that on Fig. 35, it is evi-dent that the strange hour numeralson both are a variation of the samecharacters. These, so-called, Turk-ish watches were made in Europe forthe Eastern trade. First-class samplesof this triple-case type are gettingscarce, but I ha
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