. Railway mechanical engineer . pe ofhigh-speed ball-bearing screw jack is made in heights of20, 24 and 26 in., capable of maximum lifts of 6, 10 and12 in., respectively. Heating Rivets —In a paper read beforethe American Electro-Chemical Society, Chicago, G. states that two American concerns have developedmethods of heating rivets electrically. The American Carand Foundry Company employs a method whereby the rivetitself forms a short-circuit connection across the secondary. Duff 75-ton Jack is to Move and Rapid in Action. base. As shown in the illustration, the weig
. Railway mechanical engineer . pe ofhigh-speed ball-bearing screw jack is made in heights of20, 24 and 26 in., capable of maximum lifts of 6, 10 and12 in., respectively. Heating Rivets —In a paper read beforethe American Electro-Chemical Society, Chicago, G. states that two American concerns have developedmethods of heating rivets electrically. The American Carand Foundry Company employs a method whereby the rivetitself forms a short-circuit connection across the secondary. Duff 75-ton Jack is to Move and Rapid in Action. base. As shown in the illustration, the weight is thus con-centrated at the bottom instead of the top and the jack isnot top-heavy. Another advantage is that the point at whichthe operating lever is pivoted does not rise with the load,which allows a full, pow-erful stroke regardless of the heightof the load. The Duff jack is unusually easy to move about, not onlybecause the concentration of weight in the base gives a lowcenter of gravity, but because, by inserting the operatinglever in a special socket, the jack can be tipped over by oneman and rolled on its own wheels wherever needed. Theload on the jack is raised by means of a six-foot steel lever of a transformer. A spring device holds the rivet in the de-sired position across the ends of the transformer while theoperator holds the rivet with a pair of tongs and brings thespring holding device into operation by means of a foot consumption of electrical energy is about
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
