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Show BAKE AND CHiLL V.ATCi-.tC I Tests for Timepieces Made In Ovens and Ref r iterators by the Manufacturers. y After Jie many sm;ill purls of a watch nave been as-mob-d und 0 titled Into the ra.se, a number of . -v teritH have U be made bf-r'.u-e the ': wa'tch Is n-ady to p:i-s inio the ' ' possession of a new owner. ' 1 One of the most necessary tilings ' ' to look out for is the action which ' changes of temperature have upon the works. Extremes of heat and " cold affect the running of a watch , considerably. You may, perhaps, have noticed with your own watch ! that It cannot be relied upon to r keep accurate time If the weuther makes a sudden Jump from heat to H cold, or vice versa. , $ It will elt'ier gain or lose, and , you will wonder what Is happening d to It. When the weather becomes yc normal again, the watch will be-- be-- have properly. Expensive watches y are adjusted for temperatures i h varying between 85 degrees and 05 '1 degrees. : -t Each watch Is put In a tg fly-'"1 fly-'"1 fitting case, and placed In a cham- 1 ber, the temperature of which Is slightly above freezing point. Its movement 1b observed very carefully, care-fully, and adjusted from time to time, until the watch is going correctly. cor-rectly. " The timekeeper Is then moved from the cold chamber, and gradually grad-ually hen ted In a specially con-, con-, atnicted oven, the temperature of which Is between SO and 100 de-d de-d grces. Here Its Internal arrangements arrange-ments are still carefully watched and ndjusted from time to time. , When the watch Is going correctly .i In this temperature, it Is returned to the cold chamber for further adjustment, ad-justment, If nocessnry. It spends about a week In each chamber. J: By the time a watch has passed i the tomperature tests, it will go I' correctly In any climate. Chro-nometors Chro-nometors ordered specially b7 ex-,; ex-,; plorers and travelers who are go- ing to places where great extremes v of temperature are encountered undergo voj-y searching tests to ' make them thoroughly reliable. H London Til-Bits. |