Zon, Raphael, 1874-1956, Graves, Henry Solon, 1871-1951 · Washington, D.C. : U.S. Dept. of Agriculture, Forest Service · leaf 43
of a slide S working between two flanges (/).By turning the inner case B the strip of paper is made to revolvepast the opening. The outer face of B is graduated into 25 equalparts, which are numbered consecutively in such a manner that thenumber opposite the opening will always indicate the number… … Fig. 6.—Wiesners insolator. S, Slit in theblack paper; N. P., normal paper ; N. S.1, normal shade (1 unit); N. S. 10, ashade equal to 10 units of normal shade. METHODS OF DETERMINING TOLERANCE. 39 made at a time. The photometer is made of aluminum; it weighsbut a few ounces and may be conveniently…
Plants Effect of light on · Trees Growth · Light Effect on trees · Tree growth
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