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 29
the line of centers. With B as the center of the escapewheel and N as the radius, describe the arc C N C, This is theprimitive or first circle of the escape wheel. Upon this circle thelocking corners of all the escape wheel teeth will rest. On eachside of the line B X lay off two angles each… … C-^--^ l-^ Fig. 10 25 to the arc C C . The tangent lines G A and H A meet on the lineB X, namely, at A, this being the pallet center. Above the tangentline G A lay off an angle of 3 degrees as shown enclosed by thelines K A G. This is the angle of lift for the teeth of the escapewheel. Where K A…
Clocks and watches
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