east cost for construction and may be used. sirable to use the screening device. The machine is con- maintenance. They should be composed of hard, tough, and To secure firmness and unity of mass on soft ground, a structed of solid castings of great strength, and such of its durable materials, laid… … a brief consideration ble stones firm and in Fig. 1,-BLAKB'S STONE CRUSHER, IN OPERATION of their relative modes tact, and in preventing ficulty. The proper speed for these machines is about 200 the stones working up and destroying the surface. A remedy of construction, we may refer to a standard…
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