Handbook for architects and builders . at least 28 days, and, to satisfactorilyI)ass the tests, shall remain firm and hardand show no signs of distortion, checking,cracking, or disintegrating. Portland Cement. 17. Definition. This term is applied to thefinely pulverized product resulting fiom thecalcination to incipient fusion of an inti-mate mixture of properly proportioned ai-gillaceous and calcareous materials, and towhich no addition greater than 3 per cent,has been made subsequent to calcination. Specific The specific gravity of cement shallnot be less than Sliould the t
Handbook for architects and builders . at least 28 days, and, to satisfactorilyI)ass the tests, shall remain firm and hardand show no signs of distortion, checking,cracking, or disintegrating. Portland Cement. 17. Definition. This term is applied to thefinely pulverized product resulting fiom thecalcination to incipient fusion of an inti-mate mixture of properly proportioned ai-gillaceous and calcareous materials, and towhich no addition greater than 3 per cent,has been made subsequent to calcination. Specific The specific gravity of cement shallnot be less than Sliould the test ofcement as received fall below this require-ment, a second test may be made upon asample ignited at a low red heat. Tlie lossin weight of the ignited cement shall notexceed 4 per cent. 241 Elevators ^Conveyors FOR EVERY PURPOSE The illustration shows the Peck Carrier for hand-ling coal and ashes in Power-House. Our BookNo. 81 A. H. describing this carrier, is a treatiseon conveying that every engineer should for
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