Detroit. Public schools. Dept. of instruction, teacher training and research. [from old catalog], Kepler, Frank Roy. [from old catalog] · Detroit · leaf 10
d have the point b in com-mon. A Line in Space (5) A line perpendicular to either plane of projection hasfor its view on that plane simply a point, Fig. 8. (6) A line perpendicular to either plane of projection hasfor its view on the other plane a straight line perpendicular tothe Ground Line and…
Projection
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
