Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 231
ond disc o with a 208 STARGAZING : PAST AND PRESENT. [book III. notch cut in it into wliicli a tongue on the lever enters ;this acts as a safety lock, as the lever can only movewhile the pin i is in the fork of the lever. The escapement we next describe is that most generallyused in chronometers, s… … ^r^ 9
Astronomy · Telescopes
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