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Originally engineered by Gallet for the adverse conditions of the battlefield, the Clamshell chronograph derived its nickname from the way that the upper and lower sections of the watch case compressed together over a specially flared crystal, protecting the delicate inner mechanisms from the intrusion of water, dirt, dust, and caustic chemicals.
The Dueber-Hampden Watch Company was an American watch manufacturing company. [1] In 1888 the Dueber Watch Case Company operating in Cincinnati from 1864 bought the Hampden Watch Company of New York, in operation since 1877. Dueber moved them both to Canton, Ohio, where Hampden used the Dueber cases until the companies merged in 1923. Pocket ...
A case for a pocket watch, 1870. The outer clamshell protects the watch. The inner layer contains a glass window. The ring is for the attachment of a chain. A usually metal clamshell case for a mechanical watch, [1] common until the early twentieth century. It is meant to sit around the inner case of the watch. [2]
The Model 23 was a 16-size chronograph pocket watch. The Model 4992b was in a 16-size case with a black dial. It was used as the pocket watch for the U.S. military, featuring a less accurate 21-jewel railroad grade movement. [citation needed] By 1970, 13,086 Hamilton Model 21 Marine Chronometers had been produced.
A problem with this technology is to accommodate for thermal expansion of the liquid contained inside the watch. The employed oil changes volume by 10% over a temperature range from −20 °C (−4 °F) to 60 °C (140 °F). This property endangers a traditional watch case since the crystal would blow out from any significant internal overpressure.
1953: Patent for a 24-hour watch, used for the Airman [26] 1955: Patent for a seconds hacking mechanism, invented by Georges Godat, and purchased by Glycine for its use in the Airman and Combat [2] [27] 1959: Glycine's patent for vacuum-sealed watch cases [11] 1970: Glycine's final patent—a crown allowing the operator to regulate time [28]