. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 42 THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. [February, simple, straightforward, and direct manner, the power by which the striking block B is lifted, or raised up. Gravity performs the down- ward action for us in a most direct manner. In order to set this steam hammer in action, steam of such a pressure as, operating upon the underside of the piston, will a little â more than balance the weight of the block B, is conveyed from a suitable boiler, (situated in any convenient


. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 42 THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. [February, simple, straightforward, and direct manner, the power by which the striking block B is lifted, or raised up. Gravity performs the down- ward action for us in a most direct manner. In order to set this steam hammer in action, steam of such a pressure as, operating upon the underside of the piston, will a little â more than balance the weight of the block B, is conveyed from a suitable boiler, (situated in any convenient part of the premises,) through the pipe P into the valve box, in which a slide valve of the most simple form works. The valve being up, permits the steam to press upon the underside of the piston, and up goes the block B to any height (within the limits of the length of the cylinder) which the forge man may require. The handle E is now moved in the contrary direction, which not only prevents any further admission of steam, but also permits that which had entered, to escape by the pipe L; the instant this is done, the block B descends with all the energy and force due to its weight and the height through which it falls, and discharges its fall and entire momentum upon the work then on the anvil, with such tremendous effect, as to set the blows of all previous hammers at utter defiance .' In fact, the power of such a hammer is only limited by the size we please to make it, as tie principle is capable of being carried out to any extent; whereas, in the case of such hammers as in Fig. 1, they have their limits, by reason of the very mass of material causing them to be weaker se, by the intestinal contraction of the iron which com- poses their mass, and which in their action is so destructive and trying to such a form ; the consequence is they generally break over just behind the neck. I have only alluded to the means which this steam hammer gives of obtaining tremendous blows. Bu


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