. Journal of the New England Water Works Association . r. After cooling and contraction the excessmaterial shall be cut off level with the upper edge of the plug by meansof a heated knife blade. The collar shall be then immersed in water ofthe required temperature and left at that temperature for 15 min. Thecollar with roofing disk attached shall be screwed into the tube while thetube is in position. The water bath shall just cover the shoulder of thetube. The tube shall be filled with water of the required temperature andthe roofing disk removed by slipping it sideways. The .time (measuredby
. Journal of the New England Water Works Association . r. After cooling and contraction the excessmaterial shall be cut off level with the upper edge of the plug by meansof a heated knife blade. The collar shall be then immersed in water ofthe required temperature and left at that temperature for 15 min. Thecollar with roofing disk attached shall be screwed into the tube while thetube is in position. The water bath shall just cover the shoulder of thetube. The tube shall be filled with water of the required temperature andthe roofing disk removed by slipping it sideways. The .time (measuredby a stop watch) from the slipping off of the disk to the sudden drop of thedisk to the sudden drop of the water in the tube, shall be noted and reportedin seconds. ( uracil. 579 Precautions. Take extreme care to keep the water bath within ° the required temperature.(Float Test). This applies to the same class of material as mentioned under (4).Recently, Committee D4, have issued new detailed specifica- Support • Assembly- OF SCHUTTE PENETROMETER- Fig. [V. J=\ -,Ail±: »p fo«. -g TLUO Section SECTIOKI • Details- OF SCHUTTE PENETROMETER. Tm Disc tions for the floal instrument and these t\\iUiv somewhat from the dimen-sions illustrated. The specifications should be adhered to inorder to obtain consistent results. consistency (Float)* Apparatus. Float tester (see Fig. V). Brass plate3 5 x 8 cm. Stopwatch. Method. The brass collar shall be placed with the small end downmii the brass plate which should be previously amalgamated with mercuryby rubbing it first with a dilute solution of a mercury salt and then with Adapted from Bulletin 311, Office of Public Road* 580 TARS, NEW AND OLD. metallic mercury. Sufficient of the material to be tested shall then bemelted in a suitable container, care being taken to prevent loss by vola-tilization or formation of air bubbles. The material shall then be pouredinto the collar in a thin stre
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