National Geographic : 1919 Mar
\WLTHAM TNE SCIENTIP ICALLY BUILT WATCH AND TNE FOREIGN BUILT WATCH The Riverside The most dependable moderate price watch in the world $60 and up A Campaign to Aid You in Selecting Your Watch THE hairspring is the brain of the watch. It is the most delicate tension spring made. For use in the small sized watch, 84,000 springs are made from one pound of steel, raising the value of that pound of steel from $5.00 to $30,000. The Waltham hairspring steel is drawn through diamond surfaces, and for the smaller watches, to a third of the thickness of a human hair. The Breguet, or over-coil (named after its inventor, a famous old French watchmaker), is used on every Waltham watch. The most important part of the complete operation in making a hairspring is the forming and tempering of this Breguet over-coil. At Waltham, instead of being formed or bent by hand as a separate operation, the entire completed hairspring is formed at one and the same time, after which it is hardened and tempered in form - the invention of John Logan, American watchmaker, a genius who was a part of Waltham leader ship in watchmaking. Indeed, Waltham is the only watch maker that claims this perfect method of making the Breguet hairspring. The foreign, imported watch movement has a hairspring that is first formed in the flat, then hardened and tempered in the flat. Then the outer coil is bent to form the Breguet over-coil, which, if the flat spring were as hard as the Waltham, and properly tempered like the Waltham hairspring, it could not be bent to correct form, and would be liable to break in the attempt. Waltham superiority is in original method, secret process, unvarying quality of every important part of the watch-a quality that cannot be equaled by the foreign "hand" method of manufacture. That is why Waltham leads the world in standardized watchmaking, and why your watch selection should be a Waltham. WALTHAM THE WORLD'S WATCH OVER TIME "Mention The Geographic-It identifies you"