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Scientific American, Vol. 42, No. 15 (1880) (1880)

leaf 4

An illustration from Scientific American, Vol. 42, No. 15 (1880), 1880, leaf 4
also exercised an im- portant influence on the ultimate expense. Details were given of various works of asphalt paving carried out by the author, with particulars of the cost of maintenance. i 1 The quality of absorbing vibration, which was a marked i 1 characteristic of asphalt roadways, had been… … asphalt, 2 inches to 25g inches thick, on a foundation of evenly gummed paper carefully over it, and place between Fig. 10.—Plant Standard, filled. the leaves of a letter copying book to dry under pressure. revolutions per minute, without sensible tremor, whereas if it is placed between two sheets…

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