Walker, William, b. 1821 · New York : C. Scribner · leaf 72
T R … Fig. 28. Fig. 29. against it; whilst in the other case (Fig. 29) little or noperceptible change takes place, because the dark cloth,instead of reflecting the light, absorbs it. Except for re-flection, the shade side of objects would inevitably be black—in fact, invisible. 67. If the student will…
Drawing -- Study and teaching
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![An illustration from Vnderweysung der Messung : mit dem Zirkel vn[d] Richtscheyt in Linien, Ebnen vnnd gantzen Corporen (1525)](https://img.insideoutlibrary.com/img/200/ia-vnderweysungderm00drer-179-430.webp)
