March 1, 1918.

THE COLLIERY GUARDIAN.

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THE NEW STEEL

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COBALTCROM PATENT

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AIR HARDENING HIGH-SPEED STEEL

(British Patent No. 106187.)

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THIS Steel is now in regular use in more than one thousand
works in Great Britain, and its efficiency as a first-class
utility High-speed Steel is firmly established.

The hardening of Cobaltcrom Steel by the new method intro-
duced this year is simpler, surer and less risky than that of any
known High-speed or High-duty Alloy Tool Steel, and practically
dispenses with all skill hitherto regarded as indispensable for
hardening High-grade Tools.

The adoption of Cobaltcrom Steel results in considerable
saving of labour and marked increase in armament, motor, aircraft
and shipbuilding production ; in fact, benefically affects every
industry where steel tools are used.

It is the ideal universal tool steel for general maintenance in
machine and repair shops of all classes of industry, as tools, by
slight variation in the heat treatment, can be made either shock-
resisting or extra hard.

Tool room problems which have been regarded as imprac-
ticable have been solved by the adoption of Cobaltcrom Steel in
bars, sheets, and in particular, Form castings.

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Send your Manager, Foreman, or Tool Room Superintendent
to Sheffield to see our exhibition of milling cutter and other
castings in “ The New Steel.19

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MANUFACTURED UNDER LICENCE BY

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DARWIN & MILNER bo. SYBRY.SEARLS&Go.bo
SHEFFIELD

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SHEFFIELD

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Manufactured under licence in the United States of America by the Latrobe Electric
Steel Co., Latrobe, Pa., and Darwin & Milner, Inc., New York.

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