Chicago : Engineering and Contracting Pub. Co. · leaf 127
btained from the specific grav-ity of the tar or oil and the determined rela-tionship between the specific gravity of theplunger and its weight) ; and the weights areso adjusted on the balanced pan that a knownweight is applied to the plunger. The brake isthen released for 5 seconds to allow… … Fig. 2.—Section of South Jetty, AransasPass, Texas. load on the plunger is in excess of 10 gramsfor special No. 12, and 5 grams for the otherplungers. The plungers and loads are so selected thatthe penetration is between 100 and 200 (Dowscale), except in the case of fluid oils wherethe use of No.…
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