0m* g[YlR PROWS out HEATING AND AIR CONDITIONING Industrial process Ventilation, by William N Witheridge, General Motor$ Corp.

BUYERS' GUIDC M I D - Y I A R, 1946 POWER BUYERS' GUIDE o MID-YEAR, 1948 rfvuMfiot 4Utci FANS for .evert Industry Aeroapot and Dyoaflow Fans rata high in efficiency and safety features and offer advanced aerodyoamie design and rugged construction.

crlboa N ot tankard und heavy duly iu.auur for vloratlon ouiurol.

& TOO GOOD?

Jiula/tlUt, IMO 365 days of solid selling!

Skinner of this di*.

a POWER January--December, 1943 Puming, Harry.

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BULLETIN Nervy Control{Continued) ______ JANUARY, 15*52 8tfptfw<te touo October, 1944 Pedestal Mounted Cam Type Master Switch -- Type T-9 (Continued) stini and otker similar motor drives deck auxiliaries, The master is used with full reversing, and dynamic lowering magnetic hoist controllers providing a maximum oi five positions in each direction.

BULLETIN , 6984 (Oonllmiadl Mwy Control.

.jmmmmnmm AFFIDAVIT OF PHILLIP S.

^rpTEMBER, 1941 r0 WYNKOOP, Publisher PHILIP W SWAIN, Editor E J TANGERMAN, Consulting Editor ANNETT, S A TUCKER, L N ROWLEY, B E SAWYER, Associate Editors G A KEATES, Assistant PAUL WOOTON, Washington G C TENNEY, San Francisco H S KNOWLTON, Boston OWER FOR THE BATTLE OF PRODUCTION 59 ^filowatts Win the Modern War...................................................................................................... firJO 000,000 Hp Turned Prewar Industry's Wheels.....................................................................

Copyright 1940 BY THE American Society of Heating and Ventilating Engineers AND BY IT Dedicated To the Advancement of The Profession and Its Allied Industries text and illustrations are fully pro tected BY COPYRIGHT AND NOTHING THAT APPEARS MAY BE REPRINTED EITHER WHOLLY OR-IN .PART WITHOUT SPECIAL- PERMJSTJON'.

HEATINC VENTILATING AIR CONDITIONING GUIDE 1940 Fig. 10.

HEATING VENTILATING AIR CONDITIONING CUIDE 1940 FURNACES Furnaces for mechanical warm air systems may be made of cast-iron, steel, or alloy.