Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 32
anotherline EH can be drawn perpendicular to it, and so as to cut both the axes. Its vertical projection^^Twill be perpendicular to G E, because the latter is parallel to the paper; in the horizontal pro-jection, E, being a point in the vertical axis, will appear as A, and H will appear as H in C…
Mechanical engineering -- Dictionaries
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