The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . on the long and shortvibrations quite apart from its length. For instance, a very differentperformance may be obtained with two springs of precisely the samelength and character in other respects, but pinned in so that one hasexactly complete turns, and the other a little under or a little over com-plete turns. He argues that a short spring as a rule requires to be pinnedin short or complete turns, and a long one beyond the complete In duplex and other watches with fric- tional e
The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . on the long and shortvibrations quite apart from its length. For instance, a very differentperformance may be obtained with two springs of precisely the samelength and character in other respects, but pinned in so that one hasexactly complete turns, and the other a little under or a little over com-plete turns. He argues that a short spring as a rule requires to be pinnedin short or complete turns, and a long one beyond the complete In duplex and other watches with fric- tional escapements, small arcs of vibra-tion and short springs, it will be foundthat the spring requires to be pinned innearly half a turn short of completeturns. HAIR SPRING STUD Self-adjusting Hair SpringStud Index, shown in Fig. 15S, is a veryuseful device, and by its use the watch-maker can save much time and canobtain better results than by followingthe regular methods of determiningPlace the lower part of balance staff inround cleat A. Turn balance until ruby pin comes over oblong hole at. Fig. a movement is in beat. 187 Hair Spring Stud Index. B. Now let the balance down until roller table rests on steel centerplate. The balance will then be ready for the spring. Place the hairspring on the staff, with the stud in exact line with the line on the indexcorresponding in name with the movement you wish to put in fasten the hair spring collet on the staff, and you will find move-ment in beat. At a glance, the watchmaker may be lead to believe thatthis tool is only applicable to the fourteen movements shown on theindex, but in reality it serves for almost every movement that comesinto the hands of the repairer. For example, the line marked & Co., not only serves for that make of watches, but also forWaltham 14 and 16 sizes. Directions accompany each tool. Fig. 159 shows a hair spring stud index recently placed on the marketby A. W. Johanson. T
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Keywords: ., bookcentury1800, bookdecade1890, bookidamericanwatc, bookyear1892
