. The railroad and engineering journal . king of this press is as easy as that of a steamhammer, because a forging having a rectangular sectioncan be pressed alternately on the flat and on the edgewithout the necessity of moving it to the center of theanvil. The forge built by Cammell & Company is a brickbuilding 78 by 18 meters, wMth two wings covering the furnaces. The press is in the center of the building, onefurnace being placed at each side. Two overhead cranes,one of 110 tons and one of 150 tons, serve the press andboth the furnaces. The whole plant was furnished byDavy Brothers, of She
. The railroad and engineering journal . king of this press is as easy as that of a steamhammer, because a forging having a rectangular sectioncan be pressed alternately on the flat and on the edgewithout the necessity of moving it to the center of theanvil. The forge built by Cammell & Company is a brickbuilding 78 by 18 meters, wMth two wings covering the furnaces. The press is in the center of the building, onefurnace being placed at each side. Two overhead cranes,one of 110 tons and one of 150 tons, serve the press andboth the furnaces. The whole plant was furnished byDavy Brothers, of Sheffield. We close this description by saying that the girdersforming the upper frame, the lower frame, and the base ofthe press are of cast steel, and the columns are of forgedsteel made in the shop itself by Cammell X; Company. CHAPTER THE HIGGINSON Mr. Higginson of Liverpool, England, makes a forging press which he calls a hydraulic hammer and in which he lias dispensed with the accumulator, which is heavy. F,<,.ISS. cosily, and inconvenient. He has replaced it simply by aheavy lly-wheel on the shaft driving the pumps, wliich ful-fils the part hcrelolore intrusted to the accumulator. Thedifferent pressures required by the different kinds of workare regulated by safety valves, in such a way as to be al-ways a little below the maximum attainable. When thepress is not at work the pumps simply cause water to cir-culate through the passages. When the water is admittedto the piston the part of the stroke in which it has no workto do is accomplished by water at a pressure only a littleabove the ordinary circulating pressure ; but when thepiston meets with resistance the pressure is rapidly raisedand the work is done at the expense of the power stored upin the heavy fly-wheel. Vol. LXIII, No. 6.] ENGINEERING JOURNAL. 26s So far only three sizes of these forging presses have beenbuilt ; these have a power of 50, 100, and 150 tons, which,according to the builder, are equ
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
