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marios_ch έγραψε:

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Speedmaster

How do I use the tachymeter on Speedmaster watches?

A tachymeter is an instrument for measuring speed. It is a chronograph with a graduated dial on which speed can be read off in kilometres per hour based on 1000 metres distance.

How to read an observation on the tachymeter: Only the central chronograph seconds-hand is used. For observations of a longer duration, the indications of the timers (minutes and hours) count.

Example for calculating the speed of a car: The chronograph indicates that the distance of one kilometre has been covered in 30 seconds. The corresponding point on the tachymeter scale indicates 120. The speed is therefore 120 km per hour.

Which Speedmaster is the original Moon Watch?

The Speedmaster Professional with reference number 3570.50.00 is the original Moon Watch. This model is made of stainless steel on a stainless steel bracelet, fitted with a black dial and a hesalite crystal. It is waterproof to 30 metres/100 feet and is equipped with the calibre 1861 manual-winding movement.

Why is the Speedmaster Professional "Moon Watch" fitted with a hesalite crystal?

The Speedmaster Professional is worn by astronauts in outer space. When NASA chose this watch, they requested a hesalite crystal, which "unlike a sapphire crystal" does not break into tiny fragments on impact.This feature is very important for astronauts, as the tiny fragments of a broken sapphire crystal would pose a danger in a zero-gravity environment.

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