The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . of thelow-priced watches have some escapementfault that renders their performance muchbelow the normal standard of the grade, andFig. 203. Fig. 204. helps largely to shorten their career and make it, while it does last, a terror to the innocent wearer and repairer. Now,to thoroughly explain the fault above mentioned it is necessary to first,state it and then call attention to the illustrations. This error is the rela-tive pitch or slant of the impulse plane of the tooth and the pallet. W
The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . of thelow-priced watches have some escapementfault that renders their performance muchbelow the normal standard of the grade, andFig. 203. Fig. 204. helps largely to shorten their career and make it, while it does last, a terror to the innocent wearer and repairer. Now,to thoroughly explain the fault above mentioned it is necessary to first,state it and then call attention to the illustrations. This error is the rela-tive pitch or slant of the impulse plane of the tooth and the pallet. Whenin a perfect relation, as in Fig. 203, the tooth gets onto the impulse planeof the pallet, with its front corner touching the pallets plane and somoves about two-thirds of the way across, with only the corner touch-ing, then as it proceeds, the whole face of the tooth touches the plane,shortly after the front corner has left the plane, and thus the escapementis made. With the faulty escapement, as in Fig. 204, the pallets frontcorner gets onto the impulse plane of the tooth and thus proceeds a part. 233 Locking. of the way before the correct relation begins. Now when, as in the firstcase, the tooth rides over the pallet with its corner, the corner of thetooth cannot cut the plane of the pallet, as the metal will not act on thestone; but as in the second case, when the pallets corner gets onto theplane of the tooth and so proceeds, the pallet corner will wear the faceof the tooth, as the stone will cut the soft metal. This fault is present ina more or less degree in many escapements with the club tooth and whena watch gives trouble by failing to keep its rate after cleaning, as soonas the oil is the least dry on the pallets, it argues that this fault may belooked for. The illustrations of the two actions are purposely exagger-ated to clearly illustrate the points under treatment. LOCKING. That portion of the pallet on which the escape wheelteeth drop. MAGNETISM. The agent or
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Keywords: ., bookcentury1800, bookdecade1890, bookidamericanwatc, bookyear1892
