. American engineer and railroad journal . tig. -HIGH SPEED RADIAL DRILLINGMACHINE. FIG. 3.—HIGH SPEED DRILLING MACHINE—400—% INCH HOLES DRILLED THBOTTGH 3 IRON AT 18 IN. FEED PEE MINUTE WITHOUT INJURING DRILL. Now, however, drills of high-speed steelare to be found in most shops, and it iscertainly to the credit of British engineersthat they have responded so energeticallyto the demand for them with the resultthat they are now sending twist drillsof high-speed steel to all parts of theworld. This is but another instance ofthe very rapid progress made with thesteel during recent ye
. American engineer and railroad journal . tig. -HIGH SPEED RADIAL DRILLINGMACHINE. FIG. 3.—HIGH SPEED DRILLING MACHINE—400—% INCH HOLES DRILLED THBOTTGH 3 IRON AT 18 IN. FEED PEE MINUTE WITHOUT INJURING DRILL. Now, however, drills of high-speed steelare to be found in most shops, and it iscertainly to the credit of British engineersthat they have responded so energeticallyto the demand for them with the resultthat they are now sending twist drillsof high-speed steel to all parts of theworld. This is but another instance ofthe very rapid progress made with thesteel during recent years. At the presenttime high-speed drills are so listed anddescribed; the drills for slower cuttingbeing described as ordinary. Thewriter is perhaps not alone in venturinga prophecy that ere long, high-speed drillswill be ordinary, and slow speed drillsspecial, so special that it will be neces-sary for one to visit our museums to seethem, like the Rocket and the Wood-en Walls of old England, good in theirday, but their day gone. It
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
