Archive image from page 14 of Defects in timber caused by. Defects in timber caused by insects defectsintimberc1490snyd Year: 1927 A loss of $5 to $20 per thousand feet of timber is a conservative esti- mate. This defect is classed as ' wormholes, no living worms or de- cay,' and can not be pre- vented in the tree, but of course similar defects in the green stock can be prevented by proper handling. Pinholes one twenty- fifth to one-eighth of an inch in diameter in both heartwood and sapwood of hardwoods and soft- woods (figs. 1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 11) are caused by sim
Archive image from page 14 of Defects in timber caused by. Defects in timber caused by insects defectsintimberc1490snyd Year: 1927 A loss of $5 to $20 per thousand feet of timber is a conservative esti- mate. This defect is classed as ' wormholes, no living worms or de- cay,' and can not be pre- vented in the tree, but of course similar defects in the green stock can be prevented by proper handling. Pinholes one twenty- fifth to one-eighth of an inch in diameter in both heartwood and sapwood of hardwoods and soft- woods (figs. 1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 11) are caused by similar The defects caused by these pinholes and stains (discolored streaks and patches) (figs. 1, 2, 3, 4, 6, 9, and 13) reduce the grade of timber and its full strength, unfitting it for structural timber, wagons, agricultural implements, tight cooper- age, and shingles. A 25 per cent loss of elm cooperage stock in logs at the mills in Illinois was due to such defects. In some cases millions of feet of timber have been reduced 10 to 25 per cent or more in value by pinhole de- fects. In deadened standing cypress in the Gulf States, pin- hole injury can be prevented by gir- dling the trees in March, April, Oc- tober, and Novem- ber (°28), but from August to Septem- ber is apparently Fig. 14.—Pinhole damage by ambrosia beetles < Xyleborus the 1110 St effective grenadensis) to Hura wood (Rakuda) imported from Ceu- tral America season. Fig. 13.—Pinholes caused by ambrosia beetles (Xyle- borus sp.) in imported greenheart (Xectandra rodioei) 3 Platypus, Monarthrum, Xyleborus.
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Keywords: 1900, 1920, 1927, americana, archive, biodiversity, book, bookauthor, bookcentury, bookcollection, bookcontributor, bookdecade, bookpublisher, booksubject, bookyear, drawing, fedlink, forest_insects, historical, history, illustration, image, page, picture, print, reference, snyder_thomas_elliott_b_1885, u_s_department_of_agriculture_national_agricultu, usdanationalagriculturallibrary, vintage, washington_d_c_u_s_dept_of_agriculture, wood
