. Railway mechanical engineer . lve stem is attached. ^^hen the design of this steam diesi was prepared it wasthought that the circuitous course the exhaust steam followedwould have a tendency to increase the back pressure in thecylinders, and for tliat reason special care was taken to pro-vide passages of ample cross-sectional area. Experiencewith the converted engines indicates that this has been suc-cessfully overcome, as there is no perceptiljle increase ofback pressure over the locomotives of the same type fittedwith slide valves. A jxitent on this steam chest has beengranted to ^Mr. Clar
. Railway mechanical engineer . lve stem is attached. ^^hen the design of this steam diesi was prepared it wasthought that the circuitous course the exhaust steam followedwould have a tendency to increase the back pressure in thecylinders, and for tliat reason special care was taken to pro-vide passages of ample cross-sectional area. Experiencewith the converted engines indicates that this has been suc-cessfully overcome, as there is no perceptiljle increase ofback pressure over the locomotives of the same type fittedwith slide valves. A jxitent on this steam chest has beengranted to ^Mr. Clark and the manufacturing rights are con-trolled by the Franklin Railway Supply Company, Xew York. ARC WELDING TOOL WITH POSITIVEELECTRODE CLAMP In metal electrode arc welding, a considerable portion ofthe operators time i.; consumed in changing welding elec-trodes. A variety of welding tools have been developed andplaced on the market. The oldest forms consisted of a pairof spring tongs which had to be spread apart by an instru-. /irc Welding Tool with a Positive Clamp for Holding MetalElectrodes ment similar to an offset screwdriver when it was desiredto insert the electrode and release it. Another type em-ployed a pair of tongs which could be operated Ijy a thumljlever. The disadvantage of this scheme was that in casethe electrode stuck to the work the operator released thetool, drawing an arc between the tongs and the electrode, apractice which soon destroyed the tongs. The t\-pe in mostcommon use employs a strong compression spring. If thisspring is strong enough to hold the electrode when itfreezes to the work so that the electrode cannot be pulledaway from the tool, it requires considerable strength tooperate it and is therefore not always suitable where girloperators are employed. .\fter a study of these conditions the tool shown in was developed and patented by the Arc Weld-ing Machine Company, Inc., New York. The wasto make the operation of ch
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
