Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 109
ales as those of the plan;but they may be made of thick drawing-paper orpasteboard. For extensive plotting, as in govern-ment surveys, the offset scale may be made to slidein a groove upon the plotting scale. In protracting the triangles of an extended trigo-nometrical survey in which the sides… … Fig. 200. PLOTTING. 93 The outlines of the survey having been balanced and plotted in, with thesubsidiary points, as established by offsets and by triangles, the filling in of theinterior detail, with the natural features of the ground, from, the skeleton orsuggestions in the field-book or other…
Mechanical drawing
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