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Show BUILDING A WATCH WATCII WATCIIFor WATCHFor For sheer heer mechanical mechamcal ingenuity Ingel1Ulty it 1t is 1s piobable plObable probable that thatthe thatthe thatthe . watch v.atch vatch makes greater demands demandsupon demandsupon demandsupon the building of 1fine a 1\ 1 \ fine upon the engineer than the production IProduction of any other'machine other othermachine true oy oythe otthe ot otthe This is especially machine 'machine ' , " in common conunon use the very small mall wristatcl1es wrist \ viatches \\atcl1es atcl1es catches with their ntany nnny.p-wts nnny.pwts nnny.p nnnyp wts m\nY'p1.rts mnYp1.rts m nY'p1.rts nYp1rts ' \ ' . puts . - ofmlcloscopic ofmicroscopic of ofnncioscopic nncioscopic mlcloscopic microscopic sizeSome sizeSome size sizeSome Some of the difficulties . which v.hich vhich must be overcome overcome.ere overcomewere overcomewere \.ere .ere were \ . iccently recently lccentJ . dcsciibed dCSClibed described by Milton F Manby , a well- well welll.non wellknoan well-known well known - l.no\n l.non l.no lno n knoan l.nonatch . \ , \ watch \\atch atch engineer engincer who states that desigmng designing desigmngnd designingand designingind \nd nd and ' \ putting a new . watch v.atch vatch into mass pioduction ploductlOn production some some- sometimcs sometimes sometimes - timcs times times takes tahes as long as two years yearsAfter > ) eaTSAfter eais eaTS eaisAfter After the drawings draw111gs are finished , e expert expel pe1t pe1tatch t watch \\atch- atch watch- watchmakers \ watchmakers ' \ atchmnkers - makers mnkers must construct construc a \ working orkmg model of the new newdesign newdesign newdcsig-n newdcsig n design - , making each cach part by b ) hand Into a space spaceabout spaceabout spaceabout about the size of a nickel in m the smallestatche smallest \\atche atche watches \ watchermust \ : . , , must go some 180 parts , of which 50 must ha\e ha e ha\c c base \ flee- flee fiee- fiee fleedom fieedom fiee-dom fiee dom - dom to move The most tiny tmy parts are the scre\\s scre s screws scresWhICh screwswhich screwswhich \ WhICh go into tlie the rim of the balince bahnce balance wheel , ne1.rly ne1rly nearly neirly8000 . 8000 8 000 of " which "hleh hleh could be held in ill m an ordmalY ordinary ordinal y thImbleThe thimbleThe thimble thimbleThe The moving mov1l1g paits parts must be made only fiom flom from metal metalalll metalalloys metalallots alll alloys ) s " which "hlCh hlCh do not contI contiact contract act or expand " - with ith cl angp angas angasin angpsin In temperatuie tempe.ratUle temperatUle temperature . , otherw1se otherwise otherw se regularity of motion could couldnot couldnot couldnot not be obtained Great ingenuity 1l1genuity Is displayed in 111 the thealrnngement thearrangement theairangement alrnngement arrangement of combinations combmatIons of metals to ovelcome overcome ovelcomethis overcomethis oveicomethis this difficulty , as well Hell \ elJ as to . guard g1.lard g1lard against magnetization magnetiza- magnetiza magnetization magnetiza-tion magnetiza tion - tion of the pal partsWhen paits parts paitsWhen ts tsWhen When the first watchesere watches were \\ere ere \ ' made i 1 < ' i not definite defimte- defimte definite- defimtely definitely definitely - ly . known l.nown lnown but their thelr manufacture is i5 supposed to ha\e ha e hale haeclosely haleclosely haveclosely \ closely followed IoJlo\\ed IoJlo ed \ the invention of the mairsprnig mairsprmg for forclocks forclocks forclocks clocks , about the iear sear ear 1500 It would be interestingto interestl1lgto interestl1lg interesting to compare the earliest earl1est crudeatches crude \ watches \\atches atches atches1th \ with \\1th 1th \ the mag- mag magmficent magnificent mag-jnficent mag jnficent - - mficent nificent time-pieces time pieces - of the preesnt day |