. Bulletin of the Department of Agriculture. Agriculture; Agriculture. —j4jSheet of lead alloy which was covered by the sheet of zinc, B. Most of the beetles were unable to penetrate the zinc and stopped in A. One, marked A on sheet B, did penetrate thezuic. (Table 1, No. Photograph by H. E. Fig. 4.—Sheets of lead aUoys tacked over infested wood. / was covered with a sheet of lead carborundum coated on the upper or outer side. It did not seem to stop the beetles at all. Note clean-cut holes. // was covered with a sheet of lead carborimdum coated on the inner side next
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. —j4jSheet of lead alloy which was covered by the sheet of zinc, B. Most of the beetles were unable to penetrate the zinc and stopped in A. One, marked A on sheet B, did penetrate thezuic. (Table 1, No. Photograph by H. E. Fig. 4.—Sheets of lead aUoys tacked over infested wood. / was covered with a sheet of lead carborundum coated on the upper or outer side. It did not seem to stop the beetles at all. Note clean-cut holes. // was covered with a sheet of lead carborimdum coated on the inner side next to it. It seemed to stop most of the beetles. Note how they mined to the side in attempting to escape boring through it. (Table l,,2b.) Photograph by 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, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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