The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . s ; then the car-riage and rails are conveyed bodily by geared cross-tracks,or racks, to a position opposite the next set of rolls, and soon. All the movements are carried out by means of elec-tric motors mounted individually on each carriage, and allis controlled by levers and switches from two pulpits oneither side of the train. The stands of rolls are changedwhen desired by means of a forty-ton electric crane offorty-eight feet span. Twelve spare stands of rolls arekept for changes,
The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . s ; then the car-riage and rails are conveyed bodily by geared cross-tracks,or racks, to a position opposite the next set of rolls, and soon. All the movements are carried out by means of elec-tric motors mounted individually on each carriage, and allis controlled by levers and switches from two pulpits oneither side of the train. The stands of rolls are changedwhen desired by means of a forty-ton electric crane offorty-eight feet span. Twelve spare stands of rolls arekept for changes, and a stand can be removed and anotherput in its place in less than an hour. Beyond the rail-train extend the delivery-tables, withthree steel-saws, such as that shown in the saws run at an enormous velocity, and sever the 234 WONDERS OF MODERN MECHANISM. rails by melting or burning. Here is also a cambering-macliiue. At right angles to the tables are two series ofhot-beds, to either of which the rails may be moved by apusher worked by a >vire rope. These hot-beds will ac- FiG. .A-.^jjt^^:^ II TiKWiii^i iiVitt*iiaitiiiMMfatitMlia>tt«.THE SELLERS STEEL-SAW. commodate girder-rails as long as sixty feet. The arrange-ment of the hot-beds divides the product of the mill intotwo parts, each of which has its own automatic rail-straightening machines are employedhere. Next the rails go to a finishing-mill, in which theends of the rails are milled off, drilled, and fitted. Theyare then delivered to the cars for shipment. The two boiler-houses are supplied with coal by auto-matic contrivances, so that there is no touching of the coalby hand from first to last. Electric elevators and con- THE MANUFACTURE OF STEEL. 235 veyors bring in the coal, and it is fed to the boilers byMurphy mechanical stokers. Slack coal is used, at a costof only ninety cents a ton delivered, so that the power isobtained very cheaply. In the manuf
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Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectmechanicalengi
