Twenty Years

Cover Twenty Years
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Absorption of Vibration by Bituminous or Asphaltic Concrete and Compressed Asphalt Powder in Moulds. One of the most interesting applica- tions of asphalt is that of bituminous or asphaltic concrete for quick-speeded machinery, such as dy- namos and their motors, grinding machinery like Carr's disintegrator (700 revolutions per minute) C 2 20 NATURAL ASPHALT.
hydro-extractors (1400 revolutions per minute), printing-machines, and percussive machines like gas - engines, stamping-presses, steam -
...hammers, spring-hammers, &c.
The author has during the last twenty years arrested many a lawsuit begun by indignant neigh- bours against users of machinery in the crowded houses of cities. A high-speed engine working in a cellar will make a seven-story house tremble, and at night prevent sleep of the inmates.
The asphalt concrete may be run in moulds to any shape and sold by the cube.
The cure is complete, when the mass is big enough. For instance, take the foundations for a stamping-press, the gradual annihilation of the concussion can be felt by placing the hand on the side of the block of bituminous concrete which receives it.


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