Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 211
n escapement now in use. Marine chronometers have one advantage over all port-able time pieces—they have to be adjusted for one positiononly, as it is suspended horizontally in gimbals, and the outercase of the movement is often heavily weighted in orderthat it may always remain in the same… … Fig. I. which has such a fine rate must have many more. Suchis not the case, however, as many of the very finest oneshave but nine or eleven jewels. A good, hard brass bearingfor a pivot is about as good as a jewel if well oiled, andwill wear a great many years. By keeping the movement constantly…
Clocks and watches
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