The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . Fig. 143. Fig. 143 shows the piece of work marked A, being gauged, while B rep-resents a stationary spindle to get the depth of a hole or recess or thethickness of any piece of work which will be indicated on the dial. Another form of registering gauge is shown in Fig. 144. It is anEnglish gauge and but little used in this country. The principle of itsconstruction however is good and any ingenious watchmaker can makeit. The back of the dial is recessed and arranged as in Fig. 145. One 17
The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . Fig. 143. Fig. 143 shows the piece of work marked A, being gauged, while B rep-resents a stationary spindle to get the depth of a hole or recess or thethickness of any piece of work which will be indicated on the dial. Another form of registering gauge is shown in Fig. 144. It is anEnglish gauge and but little used in this country. The principle of itsconstruction however is good and any ingenious watchmaker can makeit. The back of the dial is recessed and arranged as in Fig. 145. One 173 Gauge. limb is fixed; the other is pivoted, and has a few rack teeth taking intoa center pinion. The pinion carries the hand, which should make a. Fig, 144. revolution in closing the calipers. The spiral spring attached to thepinion is to keep it and the hand banked in one direction for spring s is to keep the jaws open. The milled headed screw andthe clamp c are to fix the jaws in case it is required to do so. A coveris snapped into the recess, and takes the back pivot of the pinion. Staff Gauge. The tool shown in Fig. 146, the invention of Mr. , is designed for measuring the height of the balance staff fromthe balance seat to the end of the top pivot. The illustration is enlarged to give more distinctness. E E is a piece of curved steelabout gtjj of an inch thick, and y^ ofan inch wide. On the lower sidefrom E to the end the arm is fileddown in width and thickness tocorrespond to an ordinary balancearm; C is a slot in the upper arm ^,which allows A, ^, Z?, A to bemoved backward and forward. DDis a round brass post drilled andtapped, the part D has a thread cuton it, and the part shown in the slotC fits with e
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Keywords: ., bookcentury1800, bookdecade1890, bookidamericanwatc, bookyear1892
