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AMERICAN SOCIETYOF HEATING & YENTILAIIN6 ENGINEERS GDIDEJ923 a gas steam boiler, giving an evaporation of 465 lb. of water (from and at 212 deg. fahr.) with a consumption of 1,000 cu. ft. of gas: .

Heaters, Water The Patterson-Kelley Co. 101 Park Avenue New York City Preheaters, Heat Exchangers, Headers for Chemicals, Gases, Oils.

Hoffman Specialty Co., Inc.

Valdes and Heating Specialties Detroit Iubricator Company DETROIT, Us S .

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American Society of Heating and Ventilating Engineers Guide; 1924-25 HOW TO CLEAN WATER-GAGE GLASS ON STEAM BOILER WITHOUT REMOVING IT 1.

American Society of Heating and Ventilating Engineers Guide, 1925-26 efficients are always based on the difference between the air temperatures on the inside and the outside of the wall.

American Society of Heating and Ventilating Engineers Guide, 1925-26 .sc '< U. d a Q .OClntN o - Tf sOO O wSa^fO'ooo fO 06 O' T* *0 -l O' ^-t cm ^ r- --< Tf* - sa S3 j xD <g a> I> OH fgrf Va) Wj &<-> '!

American Society of Heating and Ventilating Engineers Guide, 1925-26 5 aj5 o^ HCQ oOoO*OoOooOQ 'ONh*f^00 0*^*^0*00*00**0-' Os O C4 *3* *n SoOO N*-o O<*-NO Cot*O) r^*To-CoSOfS-iCf*N5 2 300 0 2 Os *T O lO *-> 3**oooOs- | 4= 0w 23 H-g J.tJ Hfl- s c* > 2 < O 2 c SE fc gw 3- ffMh OJ ft. as 0H <| < oi *5 j 3 & iz P< 3 qM-X1 os's ssi <j oi 5UC3Q ofc <Scn-u Qg S-g w <o g* co ~S W <O wsS CD 3 33 C4 'o ** -- r-- C4 O CO OO N Is* N Nai'OCOO ''OOrmHoU\^Q^lcO tN't'OCOO O'OOn-*5 *5 S3 00 N't'OOOO NNNNfO 00 rj< O' 03 OO omcs -mo3< rmo-- Omo' --"< i,s?

American Society of Heating and Ventilating Engineers Guide, 1925-26 The percentage of air recirculated may be varied to suit the seasonal changes so as to conserve heat in winter and refrigeration in summer.

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