Time is the fundamental basis for ballistic calculations and for analyzing weapon fire. While the high speed of such projectiles cannot be timed using a conventional chronograph, this instrument equipped with a telemetric scale was used for many years by artillerymen in order to adjust cannon fire. Telemeters, such as the one developed by firms such as Baume & Mercier, is a device serving to measure the distance separating an observer from a visible and audible phenomenon. Its principle is based on the difference between the speed of light and the speed of sound which is arbitrarily defined as 303 meters per second at temperatures ranging between 5 and 10°C. The distance indicated on the dial and plotted in the direction indicated by a compass on an official military map served to determine the position of the enemy cannon and potentially to adjust the counter-fire. Today, this instrument can be valuable for anyone at land or at sea who is seeking to find shelter from an approaching storm.
Technical Description
18K yellow gold cushion-shaped case fitted with a 32 mm-diameter round dial opening. Mechanical hand-wound movement by Raymond F – Vallée de Joux. 30-minute counter at 3 o’clock, small seconds display at 9 o’clock, telemetric scale, single-pusher on the crown. Round champagne-colored dial bearing the inscription. ®Baume & Mercier Genève.
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