Lange, David C. (David Christoph) · New York, John Wiley & sons, inc.; [etc., etc.] · leaf 39
26 PRINCIPLES OF DESC^UPTIVE GEOMETRY … is the required angle which can beseen in its true size by revolving itand the plane O containing it aboutits traces into either coordinate.
Shades and shadows · Geometry, Descriptive
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
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