. Guidebook for the identification of woods used for ties and timbers . lt>0Oo00U0°0000 0 OooOeQO°0P 0 0 0°. Fig. 3.—A ring-porous wood with radialarrangement of pores in the summer-wood. Fig. 4.—A ring-porous wood with wavy,tangential arrangement of pores in thesummerwood. The area which is cut smoothly for observation need not be large(about one-half inch square), but should contain annual rings ofaverage width, preferably not near the center. In very narrow orvery wide rings the characteristic structure of the wood is somewhat o ° 9 o0O e O 0 0 6° 00 909 o0° 0 8 e oo © oO oQC0 0 o 0 o Fi
. Guidebook for the identification of woods used for ties and timbers . lt>0Oo00U0°0000 0 OooOeQO°0P 0 0 0°. Fig. 3.—A ring-porous wood with radialarrangement of pores in the summer-wood. Fig. 4.—A ring-porous wood with wavy,tangential arrangement of pores in thesummerwood. The area which is cut smoothly for observation need not be large(about one-half inch square), but should contain annual rings ofaverage width, preferably not near the center. In very narrow orvery wide rings the characteristic structure of the wood is somewhat o ° 9 o0O e O 0 0 6° 00 909 o0° 0 8 e oo © oO oQC0 0 o 0 o Fig. 5.—A ring-porous wood withoutdefinite arrangement of pores in thesummerwood. 0 o o o ° o ° O o 9 a 9 o o o o o o 0 a d o 8 •■ 9 o o 0 0 © o ° ° t ° o O > (p 0 0 0 0 ° O o 0 0 ° o ° o O0 o °*oc >£ . * • 0 O c c ■ o ° • Fig. 6.—A difluse-porous wood. modified and does not serve so well for identification moistening the surface often brings out the features to better advantage. THE DISTRIBUTION MAPS AID IN IDENTIFICATION. The keys ran often be simpl
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashingtongovtprin
