A rectangular watch designed by Louis Cartier. The bars along the sides of the watch were inspired by the tracks of tanks used in World War 1. A telemeter determines the distance of an object from the observer by measuring how long it takes sound to travel that distance. A metal that is used for some watch cases and bracelets. Titanium is much stronger and lighter than stainless steel.
Titanium is also hypo-allergenic.
A watch shaped like a barrel, with two convex sides. It is designed to prevent a diver who has unwittingly knocked the bezel off its original position from overestimating his remaining air supply. Because the bezel moves in only one direction, the diver can err only on the side of safety when timing his dive. Many divers' watches are ratcheted, so that they lock into place for greater safety. The ability to withstand splashes of water.