A hand-book for mapping, engineering, and architectural drawing : in which maps of all descriptiosn are analyzed, and their several uses fully explained ; intended for the use of civil engineers, architects, and surveyors, also for naval and military academies, engineering schools and colleges, and draughtsmen ; illustrated with forty-three large plates and thirty-nine woodcuts, among which will be found examples of a parliamentary railway plan, section, and cross sections, prepared in compliance with the standing orders of the House of Commons ; with plain instructions for lithographing and zincographing maps and drawings, and an exposition of the relative cost and merits of engraving, lithographing, and zincographing (1846)
Wilme, Benjamin P, History of Engineering Collection (North Carolina State University). NCRS · London : Published for the author by John Weale, 59 High Holborn · leaf 65
colour 18 spaces in such away that if they be numbered 1,2, 3, 4, &c., No. 1 shall bear no resemblance whateverto No. 2, 2 to 3, or 3 to 4. As in this case we only require the neiqhhouring colours tobe dissimilar, I propose doing it as follows, viz.:—Let us find how many different classesof… … ^aa ? s ■= ^ m ^ a) o S & ji 5 P I ^ .9 ■^ -S 1 I e ;Z. vA f4 42 HAND-BOOK FOR MAPPING, ETC. It will be seen that six classes of colours are employed, and that the number ofspaces being 18, we can reiioat each class of colour three times; that is to say, of theclass blue we use three different…
Mechanical drawing · Topographical drawing
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