Wood and Other Organic Structural Materials (Google eBook)

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McGraw-Hill book Company, Incorporated, 1917 - Adhesives - 478 pages
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Page 277 - The American Society of Mechanical Engineers and is administered by a Board of Award consisting of representatives of the American Society of Civil Engineers, the American Institute of Mining and Metallurgical Engineers, The American Society of Mechanical Engineers, and the American Institute of Electrical Engineers.
Page 1 - Wood is an indispensable part of the material structure upon which civilization rests ; and it is to be remembered always that the immense increase of the use of iron and substitutes for wood in many structures, while it has meant a relative decrease in the amount of wood used, has been accompanied by an absolute increase in the amount of wood used. More wood is used than ever before in our history.
Page 260 - ... measured over the third, fourth and fifth inches on a radial line from the pith. Wide-ringed material excluded by this rule will be acceptable provided that the amount of summer wood as above measured shall be at least one-half. "The contrast in color between summer wood and spring wood shall be sharp, and the summer wood shall be dark in color, except in pieces having considerably above the minimum requirement for summer wood.
Page 259 - Strength Values for Structural Timbers," Cline (United States Forest Service, Circular No. 189) ; and elsewhere.2 1 Publications of the National Forest Service. 2 See also report of the Committee on Wooden Bridges and Trestles...
Page 260 - ... all as measured over the third, fourth and fifth inches on a radial line from the pith. Wide-ringed material excluded by this rule will be acceptable provided that the amount of summer wood as above measured shall be at least one-half.
Page 367 - " " 1 hour Exhaustion Process Green and Partially Seasoned Timber. When the steaming process shall have been completed the steam shall be blown off and the treating cylinder exhausted to a vacuum of at least twenty-four (24) inches at or near sea level, or proportionately less at higher altitudes. The vacuum shall be maintained at the above minimum for a period. For heavy timber of not less than 2 hours For small timber " " " " 1 hour and if necessary thereafter until the condenser discharge...
Page 345 - ... inch above the surface of the oil the creosote, calculated on the basis of the dry oil, shall give no distillate below...
Page 43 - Spike Knot. A spike knot is one sawn in a lengthwise direction; the mean or average width shall be considered in measuring these knots.
Page 15 - By reasonable thrift, we can produce a constant timber supply beyond our present need, and with it conserve the usefulness of our streams for irrigation, water supply, navigation, and power. "Under right management, our forests will yield over four times as much as now.
Page 345 - ... it shall be completely liquid at thirtyeight (38) degrees centigrade and shall be free from suspended matter; the specific gravity of the oil at thirty-eight (38) degrees centigrade shall be at least 1.03. When distilled by the common method that is, using an eight (8...

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