File:Standard and tentative methods of sampling and testing highway materials - recommended by the Second Conference of State Highway Testing Engineers and Chemists, Washington, D.C., Feb. 23-27, 1920 (14597021159).jpg

Identifier: standardtentativ949unit (find matches)
Title: Standard and tentative methods of sampling and testing highway materials : recommended by the Second Conference of State Highway Testing Engineers and Chemists, Washington, D.C., Feb. 23-27, 1920
Year: 1921 (1920s)
Authors: United States. Bureau of Public Roads Second Conference of State Highway Testing Engineers and Chemists (1920 : Washington, D.C.)
Subjects: Road materials
Publisher: Washington, D.C. : U.S. Dept. of Agriculture
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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er of small end (permissible variation, 1.5 mm.) Diameter of large end (permissible variation, 3 mm.) Length (permissible variation, 4 mm.) 12.5 28. 5 3(50. 0 60 BULLETIN 949, U. S. DEPARTMENT OF AGRICULTURE. (c) Shield.—An asbestos shield of the form and approximate dimensions shown infigure 33 shall be used to protect the retort from air currents and to prevent radiation.This may be covered with galvanized iron, as such an arrangement is more convenientand more permanent. (d) Receivers.—Erlenmeyer flasks of 50 to 100 c. c. capacity are the most convenientform. (e) Thermometer.—The thermometer shall conform to the following requirements.The thermometer shall be made of thermometric glass of a quality equivalent to suitable grades of Jena or Corning make. It shall be thoroughly annealed. It shallbe filled above the mercury vrith inert gas which will not act chemically on or contami-nate the mercury. The pressure of the gas shall be sufficient to prevent separation of Thermometer
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Shield- Retort— Fig. 34.—Assembled apparatus for distillation test. the mercury column at all temperatures of the scale. There shall be a reservoir abovethe final graduation large enough so that the pressure will not become excessive at thehighest temperature. The thermometer shall be finished at the top with a small glassring or button suitable for attaching a tag. Each thermometer shall have for identi-fication the makers name, a serial number, and the letters A. S. T. M. distillation.?The thermometer shall be graduated from 0° to 400° C. at intervals of 1° C. Every-fifth graduation shall be longer than the intermediate ones, and every tenth gradua-tion beginning at zero shall be numbered. The graduation marks and numbers shallbe clear-cut and distinct. The thermometer shall conform to the following dimensions: Mm. Total length, maximum 385 Diameter of stem (permissible variation, 0.5 mm.) 7 Diameter of bulb, minimum I shall not exceed diameter of stem) 5 Length of bulb (perm

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