. Railway mechanical engineer . Pneumatic Hammer for Welding Bolts packing rings Js in. thick. The piston rod is 2/^ in. in diameterand has a taper fit in the hammer. The air supply to the cylinderis regulated by a rotary valve, operated by the link motion sliownin the side view of the hammer. The valve itself is also shownamong the details of the machine. It has one blind and one openchamber which alternately cover the ports A and B, shown inthe side view of the cylinder. The port C is the exhaust and isconstantly under the blind chamber of the rotary valve. Air isadmitted to the cylinder fro
. Railway mechanical engineer . Pneumatic Hammer for Welding Bolts packing rings Js in. thick. The piston rod is 2/^ in. in diameterand has a taper fit in the hammer. The air supply to the cylinderis regulated by a rotary valve, operated by the link motion sliownin the side view of the hammer. The valve itself is also shownamong the details of the machine. It has one blind and one openchamber which alternately cover the ports A and B, shown inthe side view of the cylinder. The port C is the exhaust and isconstantly under the blind chamber of the rotary valve. Air isadmitted to the cylinder from the valve chest througli the open. Cylinder Cashing. Rotary iblvl 4 I h--6i- ■y Hi-—-A Cylinder and Rotary Valve for Pneumatic Hammer chamber and the ports A and B. The exhaust pipe is providedwith a globe valve for the purpose of restricting the exhaustsufficiently to give a cushioning effect to the piston at the endof the stroke. The air to the valve chest is controlled l)y a pedalvalve at the base of the machine. This valve is by-passed forthe purpose of keeping a constant pressure under the hammer,thus holding it in its up position when it is not working. ENGINE FAILURES, THEIR CAUSES AND CURE BY J. E. Foreman, Erie Railroad, .SuMiuehanna. Ia. I have read with much care and interest the report on roundhouse efficiency presented at the General Foremens Conventionrecently held in Chicago, which concludes by stating that, per-fect organization in a round house is tlie cure for engine fail-ures. .^ great many exhaustive articles on the prevention ofengine failures have been written and it has alway
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
