Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 50
Fig. 70. Fig. 71. Figs. 70 and 71.—Circles of Equal Size Appear Unequal. hand, the eyes can sometimes see more than one would expect, aswhen a stereoscopic view is held in the hand and graduallybrought into position until the two pictures appear superposed,when the vista of true perspective will…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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