. The mastery of water. in area, the total pressurewill be 100,000 lb. or nearly forty and a half tons, and toobtain this the piston need only be just over eleveninches in diameter ; with a larger piston a correspondinglylarge force can be applied, and some of the machinesused for bending and shaping iron exert a force of 12,000tons. CHAPTER XXIX. Hydraulic Presses and Lifts. Hydraulic or Bramah presses, as they are called, aremounted in a very strong frame. At one end is a heavysteel casing containing a hollow space fitted with aplunger or ram. The other end of the ram forms a sort HYDRAULIC
. The mastery of water. in area, the total pressurewill be 100,000 lb. or nearly forty and a half tons, and toobtain this the piston need only be just over eleveninches in diameter ; with a larger piston a correspondinglylarge force can be applied, and some of the machinesused for bending and shaping iron exert a force of 12,000tons. CHAPTER XXIX. Hydraulic Presses and Lifts. Hydraulic or Bramah presses, as they are called, aremounted in a very strong frame. At one end is a heavysteel casing containing a hollow space fitted with aplunger or ram. The other end of the ram forms a sort HYDRAULIC PRESSES AND LIFTS. 177 of table upon which the object to be compressed can belaid. Above it is fixed a block against which the objectis squeezed. This is a vertical press, but they are oftenarranged so that the squeeze is exerted horizontally. The hydraulic press is one of the most valuable toolswhich the steel manufacturer possesses. It acts moreslowly than the steam hammer, by which the hot pasty L e^er tc vvorh/Pump. Vessel from whichWater is Forced THE BRAMAH PRESS. metal is subjected to furious blows ; but the pressureis applied more uniformaUy, and the steel can be bentto the exact shape, or compressed to the exact sizerequired. But there are many uses outside of iron and steelworks. Cotton and other soft goods which ordinarilytake up a great deal of room are compressed into solidbales for shipment. You probably know that cargo ischarged according to the space it takes up, 100 cubic feetbeing reckoned to the ton, and if soft goods in bales were 178 THE MASTERY OF WATER. not compressed into the smallest possible volume, thecarriage would be greater, and the cost of manufacturedgoods higher, than they are now. Hydraulic power is used very largely for lifts andcranes, though the former are now frequently worked byelectricity. When water is employed the method isalways to force out a plunger by admitting water athigh pressure behind it. The simplest kind of lift is thehydraul
Size: 2004px × 1247px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectwatersupply, bookyear
