The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 173
is parallel to the arm h, and moves with a minimumamount of friction. It is evident that any motion of thewheel c in the direction of its axis would not cause it .to re-volve, while any motion at right angles to this axis is fullyrecorded by the wheel. The arm ei is of fixed length, whilethe length… … Fig. 36. is that of revolution on C as a centre, causing P to move in acircular arc. RT is the other arm, revolving on P as a centre,and carrying at the fixed distance RP (== ri) from Pa. rolling-wheel whose periphery touches the paper at R and whose axisis parallel to RP. RTalso carries at a…
Surveying
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