The Makings Of Time Keeping

The chronograph is an accurate timer that includes the timing action of the stopwatch and also indicates the time of day

. Chronographs are valuable aids in laboratory tests and in studying the movements of stars or the time it takes a ship to sail from place to place. The most accurate astronomical clocks are used in observatories to time the movements of stars to the second.

The Makings Of Time Keeping

By: Samuel P. Mcmillian

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