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Read the excerpt from ship's Chronometer from HMS Beagle."
Our object is one of those lower-cost chronometers, made in 1800 by Thomas Earnshaw. It is made of brass and is around the size of a large pocket watch, with a normal clock dial showing roman numerals and a smaller dial at the bottom for the second hand. The clock is suspended inside a swivelling brass ring fitted to the inside of a wooden box - this is the key to keeping the chronometer level even in an unsteady ship.
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