The technic of mechanical drafting a practical guide to neat, correct, and legible drawing (1904)
Reinhardt, Chas. William (Charles William), b. 1858 · New York, The Engineering News Pub. Co. · leaf 39
Contour lines on a map, (Figs. 69 and 77) must be indicated byvery light lines. Every fifth or tenth contour should be accen-tuated by drawingsame heavier. Forthis purpose a wellworn Gillotts No.303 pen may berecommended; thiswill yield a fairlyuniform line of me-dium strength, re-quiring no… … 75. Bridge The convention for conditions, as for instance asmall plan of a drawbridgewith center pier, etc., may besubstituted for the type shownin our illustration. The strokesindicating slope in Cut andFill, or Levee in thesame figure, should be drawnin a wabbling or vibrantmanner, and, beginning…
Mechanical drawing
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