. American engineer and railroad journal . ing shifted by the lever at the side of the housing. HIGHPOWER DRILLS. \ this point the drill «i alb a - l I i i .minion ,, est commi need. of drill, irial drilled,Cutting ! per minute, 156 Inches drilled per minute, drill was removed after drill;; on - without a sign of a rlaw and cutting ondition. A high spied twisted drill that do,- not require special chucksor sockets, has recently been placed on the market by The Pratt\- Whitney Company, Hartford. Conn The increased twist inthe shank permits its use with the standard Mors
. American engineer and railroad journal . ing shifted by the lever at the side of the housing. HIGHPOWER DRILLS. \ this point the drill «i alb a - l I i i .minion ,, est commi need. of drill, irial drilled,Cutting ! per minute, 156 Inches drilled per minute, drill was removed after drill;; on - without a sign of a rlaw and cutting ondition. A high spied twisted drill that do,- not require special chucksor sockets, has recently been placed on the market by The Pratt\- Whitney Company, Hartford. Conn The increased twist inthe shank permits its use with the standard Morse or othertaper sockets. The drill is ground on the shank and barrel sothat it has the same accurate alignment as the standard milleddrill. The twisted shank is claimed to provide an even more ef-fective contact with the socket, thus .raking possible the use ofgreater driving power, than does the ordinarj -olid shank. Thebreaking of tangs and the slippil g oi hills is eliminated. The first two tests described below were made to determine. A 30 X 30 IX. BY 8 FT. CINCINNATI HEAVY PATTERN TLAXER WITH . DRIVE. 420 AMERICAN ENGINEER AND RAILROAD JOURNAL.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
