Bulletin of the of Agriculture . on mat formed from the tar having thelargest amount of free carbon appeared to be the most pervious. Tars Nos. 1, 2, and 3 were examined under the microscope at a mag-nification of 400 diameters. Plates I to III, inclusive, are photomi-crographs of thin films of mixtures of equal parts by volume of creo-sote and each of the three normal tars. It is evident that the freecarbon agglomerations are largest in the tar containing the highestpercentage of free carbon. PRESERVATIVES USED FOR THE TESTS ON THE EFFECT OF VARYING TIME, PRESSURE, AND TEMPERATU
Bulletin of the of Agriculture . on mat formed from the tar having thelargest amount of free carbon appeared to be the most pervious. Tars Nos. 1, 2, and 3 were examined under the microscope at a mag-nification of 400 diameters. Plates I to III, inclusive, are photomi-crographs of thin films of mixtures of equal parts by volume of creo-sote and each of the three normal tars. It is evident that the freecarbon agglomerations are largest in the tar containing the highestpercentage of free carbon. PRESERVATIVES USED FOR THE TESTS ON THE EFFECT OF VARYING TIME, PRESSURE, AND TEMPERATURE. By-product coke-oven tars Nos. 1, 4, and 5, and coal-tar creosotesNos. 4 and 6 were used in the experiments described on page 12. Theproportion of tar and creosote in the mixtures and the temperatures,pressures, durations of treatment, and the results obtained are givenin figures 18 to 27 and in tables 15 to 21 in the Appendix. 1 By normal tar is meant tar containing its original free carbon. Bui. 607, U. S. Dept. of Agriculture. Plate • ; f ~ A Thin Film of a Mixture of Equal Parts, by Volume, of Creosote andNormal By-Product Coke-Oven Tar No. 1 (Normal Amount of Free Car-bon in Tar, 6 Per Cent, by Weight). Magnification, about 400 diameters. Bui. 607, U. S. Dept. of Agriculture. Plate II. * > 1 ?r y ;? : , 4,* •r <* • i < | ,v- ? V •** * »- • * 1 r p r ! 1 M f % v ? , , -JT •:- ,. *S % f ll - * - *. J * . i 4 k, * &? A Thin Film of a Mixture of Equal Parts, by Volume, of Creosote andNormal By-Product Coke-Oven Tar No. 2 (Normal Amount of Free Car-bon in Tar, 16 Per Cent, by Weight). Magnification, about 400 diameters. Bui. 607, U. S. Dept. of Agriculture. Plate III.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
