Practical lessons on the lever escapement, its tests, errors, their detection and correction (1916)
Wilkinson, T. J. (Thomas Jessop), b. 1864 · Philadelphia, Penna., Technical publishing company · leaf 31
einto 15 divisions 24 degrees apart. Drawing in each tooth asspaced will yield an irregular drawing. Hence the advice: makethe divisions first, then draw in the outlines of each tooth. 26 LESSON 7 THE LEVER—DRAFTING 134. The Lever.—The lever is a straight metal bar attached toor a part of the… … Fig. 11 from F to A and D to E. The corners of the notch are respectivelymarked A and D. The slot is enclosed by the lines A B, B C, C D. 136. The Slot Corners.—In a single roller escapement onlyvery short horns on Ihe fork are necessary. In fact, the mainparts of the lever horns are the corners A…
Clocks and watches
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