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 70
deep lock. 65 LESSON 22 THE CORNER TEST IN THEORY AND PRACTICE 237. Theory of the Corner Test.—Specifications, Elgin type,total lock, 2 degrees. Freedom of the roller jewel from the slotcorner, ly^ degrees. Note.—Of the total lock, % degree belongs to the slide; theremainder, viz., l^^ degrees,… … Corner Lcve,r A^^,fnsT Fig. 26 pallet jewel to the extent of 2 degrees. The lever will be at restagainst its bank and the corner of the lever slot will be separatedfrom the path of the roller jewel to the extent of l^, degrees.239. Banked-to-Drop Specifications—Elgin Type.—Drop-lock,1^/^ degrees.…
Clocks and watches
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