The literary digest . The Riverside The most dependable moderate pricewatch in the world $60 and up A Campaign to Aid Youin Selecting Your Watch THE hairspring is the brain of the watch. It is themost delicate tension spring made. For use in thesmall sized watch, 84,000 springs are made from onepound of steel, raising the value of that pound of steelfrom $ to $30,000. The Waltham hairspring steel is drawn through diamondsurfaces, and for the smaller watches, to a third of thethickness of a human hair. The Breguet, or over-coil (named after its inventor, a famous oldFrench watchmaker), is u
The literary digest . The Riverside The most dependable moderate pricewatch in the world $60 and up A Campaign to Aid Youin Selecting Your Watch THE hairspring is the brain of the watch. It is themost delicate tension spring made. For use in thesmall sized watch, 84,000 springs are made from onepound of steel, raising the value of that pound of steelfrom $ to $30,000. The Waltham hairspring steel is drawn through diamondsurfaces, and for the smaller watches, to a third of thethickness of a human hair. The Breguet, or over-coil (named after its inventor, a famous oldFrench watchmaker), is used on every Walthami watch. Themost important part of the complete operation in making a hair-spring is the forming and tempering of this Breguet over-coil. At Waltham, instead of being formed or bent by hand as a sepa-rate operation, the entire completed hairspring is formed at one andthe same time, after which it is hardened and tempered in form —the invention of John Logan, American watchmaker, a geniuswho was a
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Keywords: ., bookcentury1800, bookdecade1890, bookidliterarydige, bookyear1890
