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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]
Display case shows and protects a painting by a follower of Robert Campin. A display case (also called a showcase, display cabinet, shadow box, or vitrine) is a cabinet with one or often more transparent tempered glass (or plastic, normally acrylic for strength) surfaces, used to display objects for viewing.
"Grid-domes", using a structural grid of roughly orthogonal members adjusted to create a double-curved surface, were employed in 1989 to create a double-glazed glass dome over an indoor swimming pool in Neckarsulm, Germany, and a single-glazed glass dome over the courtyard of the Museum for Hamburg History in Hamburg, Germany. [123]
Domes built in the 16th, 17th, and 18th centuries relied primarily on empirical techniques and oral traditions rather than the architectural treatises of the time, but the study of dome structures changed radically due to developments in mathematics and the study of statics. Analytical approaches were developed and the ideal shape for a dome ...
1939 advertisement from Jewelers' Circular Keystone magazine of the Gallet MultiChron 30 "Clamshell", the world's first water resistant chronograph wristwatch Reverse view of the Gallet Clamshell showing the 4 screws that compress the 2 part case around the flared acrylic crystal Open view of the Gallet Clamshell showing top part of the two part case and complex Swiss column wheel movement ...
Keystone Watch Case Co. was the name of a conglomerate of watch companies assembled by Theophilus Zurbrugg by 1904. Keystone purchased the rights to the E. Howard name (a legacy of the Howard Watch Company ) in 1902 and sold Keystone-Howard watches.