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Industrial Hygiene Digest INDUSTRIAL HEALTH NEWS iiau .

TYPICAL SCHOOL BUILDING OF LARGE SIZE Steel framing, brick walls with 2" T.C. furring on inside; wooden floors in rooms; T.C. partitions; furred roof; width, 60 ft.; height, 85 ft.; five stories and cellar; cost of building (approx.), $1,000,000.00; cost of heating and ventilating equip ment (approx.), $90,000.00.

Hoffman Specialty Co.

i 11 :i i i i i Equipment and Design Aids Roundup Presenting a condensation of one of the most useful and popular features the year-round.

Radiator Hangers Healy-Ruff Company Minneapolis, Minn.

_ ___ ___ _ U.lW jJ.HU'K, FROM BOILER AND PROCESS WATERS THIS NEW LOW-COST WAY!

Both Popular Types Wire-inserted woven asbestos and spiral wound metal-asbestos--for manholes, handholes and tube caps of all makes of stationary and marine boilers, water walls, economizers and other boiler accessories.

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THIS CATALOG OF GARLOCK PACKINGS AND OTHER GARLOCK PRODUCTS IS PRESENTED TO----------------------------------------------------------------------------------OF _---------------------------------------- BY--------------------------------------------------- OF THE GARLOCK PACKING COMPANY GARLOCK PACKINGS AND OTHER GARLOCK PRODUCTS THIS GARLOCK TRADE-MARK, WHICH APPEARS ON EVERY PACKAGE OF GARLOCK PACKING, HAS BEEN REGISTERED BY THE GARLOCK PACKING COMPANY IN THE COUNTRIES LISTED BELOW.

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Air Filters Spray Engineering Company 60 High Street BOSTON, MASSACHUSETTS SPRACO AIR FILTERS Spraco Air Filters constitute the most efficient device- for removing from the ventilating air, dust, dirt, and other foreign matter.

Fans and Ventilating Equipment The New York Blower Company 2254 S.