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 24
ngles, each containing 30 degrees. The angles D B H and H B Eeach contain the required 30 degrees. Draw the lines F A andA G; these lines intercept D B and E B exactly at right angles.The lines F A and A G are tangents to the circle C C and meet atthe point A on the line B H. Their meeting point is… … 20 another angle of equal size to the right of D B. The angleK B L is therefore one of 6 degrees, as called for by our specifica-tions. The angle of lock is to equal 2 degrees, therefore belowthe tangent line P A we lay out the angle F A O, containing 2degrees. At the point where the line 0 A…
Clocks and watches
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