Annual Reports of the Department of Agriculture. 1905

Annual Reports of the Department of Agriculture. 1905

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ...of posts or columns, for which now no machine exists, and the second to test the life of wood under such vibrations and repetitive stresses as come on stringers and other structural forms under the passage of a rolling or live load. Washington Laboratory, Washington, D. C.--Tests of loblolly pine for structural purposes, including the effect on strength of knots, air seasoning, kiln drying, rate of growth, sapwood. and age, and tests of the structural value of various hard woods of the southern Appalachians, and of the value of loblolly and shortleaf pine for cross arms. Yale Laboratory, New Haven, Conn.--Tests of the effect of the rate of application of a load on the strength of wood, and a study of the effect of different methods of drying on the strength of wood. Berkeley Laboratory, Berkeley, Cal.--Tests of western yellow pine as a structural timber and for telephone and telegraph poles and railroad ties, and of eucalypts. especially blue gum and red gum. Eugene Laboratory, Eugene, Oreg.--Tests of various grades of red fir for structural purposes, and of cedar for telephone poles. Seattle Laboratory, Seattle, Wash.--Tests of western hemlock for structural purposes, and of western spruce, western hemlock, and other timbers of the North Pacific region for cross-ties and telephone poles. At all points the organization for the timber-test work will be alert to come into touch with the consuming interests of the country, in order to promote the use of inferior timbers in the place of rare and expensive ones, the economy of material, and the general interests of forestry. WOOD PRESERVATION. Probably not more than 10 per cent of the ties laid for renewal in the United States are treated. Yet railroad engineers almost unanimously agree that...
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Product details

  • Paperback | 350 pages
  • 189 x 246 x 19mm | 626g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236664221
  • 9781236664228