Appleton's cyclopædia of drawing, designed as a textbook for the mechanic, architect, engineer, and surveyor (1866)
Worthen, William Ezra, 1819-1897, [from old catalog] ed, Appleton, firm, publishers, New York. (1866. D. Appleton & co.) [from old catalog] · New York, D. Appleton and company · leaf 553
have alength varying from one to three fourths of an inch, according to the great-er or less degree of the slope. When the hill is steep the lines should beshort and heavy, growing longer and lighter as the inclination becomesless. The lines should nearly touch each other, so as to appear… … Fig. 21. Drawing hills by contours is of comparatively late introduction, andis generally practised abroad, but little used here ; it is more difiicult forthe draughtsman, and no more expressive of the features of the groundthan the vertical system, and has little to recommend except where…
