Machinery and processes of the industrial arts, and apparatus of the exact sciences (1869)
Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Washington, Govt. print. off. · leaf 644
n of its movement. While the wheel is in this posi-tion it slides without revolving. Hence, for the entire circle WXYZno record will be made; and if, in the measurement, the tracer is carriedentirely round the pole P, it is necessary to add a constant which isequal to this circle in value. If the… … Fig. 149. The term bo, which is the variable part of the value of S, measures theportion of the sector PST, Fig. 148, which is between the arc describedby the tracer and the circumference of the constant circle only. Takingin Fig. 149, PS equal to PR + RS, and sweeping with the tracer aroundan…
Machinery · Scientific apparatus and instruments
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