Descriptive geometry for students in engineering science and architecture; a carefully graded course of instruction (1915)
Armstrong, Henry F. (Henry Fry), 1868- · New York, J. Wiley & sons, inc.; [etc., etc.] · leaf 29
ght may be represented by a line, and for our presentpurposes, such a hne, with an arrow-head, will serve to indicate the direction ofparallel rays of light and will be represented by projections, plan and elevation, suchas may be seen at (i) in Fig. 15, the arrow-line below XY always being the… … ! ab
Geometry, Descriptive
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
