. Bulletin. Agriculture. Fig. 3.—First two thicknesses of the three treated lead sheathings after being removed from infested section and manner in which beetles stopped as successive thicknesses were reached. Upper, embedded carborundum, where 17 beetles started in first thickness and 14 reached the second. Middle, tin-coated section, where 14 started in the first and 6 reached the second thickness. Lower, copper-coated section, with 16 and 12 penetrations, respectively. One-fifth natural size. (Table 2, Nos. 54, 54c, 54b.) Photograph by R. D. Hartman. THE LEAD-CABLE Please note that
. Bulletin. Agriculture. Fig. 3.—First two thicknesses of the three treated lead sheathings after being removed from infested section and manner in which beetles stopped as successive thicknesses were reached. Upper, embedded carborundum, where 17 beetles started in first thickness and 14 reached the second. Middle, tin-coated section, where 14 started in the first and 6 reached the second thickness. Lower, copper-coated section, with 16 and 12 penetrations, respectively. One-fifth natural size. (Table 2, Nos. 54, 54c, 54b.) Photograph by R. D. Hartman. THE LEAD-CABLE Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. Washington : Dept. of Agriculture
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectagriculture, bookyear
