Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 118
erme-diate contour-lines. The objection to the drawing of hills by any system is that the depths ofshade representing different slopes conflict with the lights and shades of the TOPOGRAPHICAL DRAWING. 101 drawing, and are therefore confusing. The plan adopted by Von Eggloffsteinin his maps was to… … Fig. 231. model from the mould, also in plaster, was then taken. This was watered whilefresh by a vertical rain from a water-pot, which broke down the vertical edgeof the contours, and gave natural lines of watershed. This model was thenphotographed under an inclined light, and gave an admirable…
Mechanical drawing
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