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 183
n thediagram. Thus, if a sectional area has been plotted with avertical scale of lo feet to the inch and a horizontal scale oflOO feet to the inch, then one square inch on this diagram rep-resents 1000 square feet of actual sectional area. The numberof square inches in the figure as given by the… … Fig. 37. It has the advantage of allowing the wheel to move over thesmooth surface of the plate S, instead of over the paper, thusgiving an error about one sixth as great as that of the ordina-ry polar instrument. The theory of its action is essentiallythe same as the other. 147. The Rolling…
Surveying
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