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Image from page 236 of “Railway mechanical engineer” (1916)

Image from page 236 of

Identifier: railwaymechanica93newy
Title: Railway mechanical engineer
Year: 1916 (1910s)
Subjects: Railroad engineering Engineering Railroads Railroad cars
Publisher: completely new York, N.Y. : Simmons-Boardman Pub. Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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Text Appearing Before Image:
o J^-in. straight air valves areused to control the operation of the clamp, one for theadmission and exhaust of air above the pistons and theother for the admission and exhaust of air below the pistonsof both cylinders. The piston heads are of the solid typewith a tapered fit on the rod. They are designed to taketwo rings of js-in. square fibre packing, which are held inplace by a steel follower ring. by E. Hanes, Stellite does not get harder as it gets hotter,but it gets tougher and holds the cutting edge longer. Cobaltis not affected by heat up to about 1,900 deg. F., andthe tungsten and chromium are not affected by any heat upto 2,600 or 2,800 deg. F. It is clear, therefore, that thecobalt becomes tougher up to the degree of softening, butat the same time the other two metals are not changed. Thismakes a closer and tougher bond, allays all cliance of cnmi-bling, and makes the tool last longer for the reason that ithas the necessary strength to take off a heavy cut withoutbreaking.

Text Appearing After Image:
TWIN SCREW DRILL CHUCK In the photographs are shown a twin screw drill chuckwhich has recently been placed on the market by the Marvin& Casler Company, Canastota, N. Y. The special featuresof this device are the twin screw clamping arrangement, andthe rugged character of the construction throughout, the pur-

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