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Heating Systems Bolen cast iron Frank Prox Company, Inc Office and plant 1201 So. First St. Terre Haute, Ind. PROX BOILERS For Large Installations in Schools, Theatres, Apartments, Churches, Hospitals, Hotels, Etc, Write for complete catalog. The 40 Series DUPLEX ECONOMIC BOILERS FOR STOKER, OIL, OR GAS Swinging connections! No vibration! No pulsation! Plenty of room for stoker, oil burner, or gas conversion burner! No iron to iron joints! Expansion and contraction troubles eliminated! The 40 Series--60-inch Water Line. The fire travel is in three successive layers--full length of the boiler three times. Rotating action of hot gases in evenly shaped flues greatly increases effective heat absorbing capacity of the large heating surfaces. Independent connections to each indi vidual section. Each section is a separate boiler with outside, accessible con nections. No shut-downs. Guarantees service since any section can be plugged off and firing continued. STEAM BOILER Boiler No. Heating Systems Boners, cast-iron The H. B. Smith Company, Inc. Westfield, Mass. Branch Offices and Sales Representatives in Principal Cities A- complete line of modern cast iron sectional boilers for residential, commercial and Industrial heating and for domestic hot water supply. SMITH "CENTURY" GAS BOILER, A.G.A. approved, for Bteam or hot water heating. Input ratings from 138,0(X) to 745,500 Btu. Combines latest features of gas boiler design. Available with five sizes of built-in tank domestic hot water heaters, capacities to 168 gal, and eight sizes of tankless heaters, capacities to 8 gpm. Entire burner assembly mounted on wrought iron frame with casters for easy removal. "100" and "2000" OIL BOILER4 BURNER steam or water units for homes and small commercial installa tions. Furnished with line of tankless heaters with capacities up to 8 gal of hot water per minute. Net radiation to 1275 sq ft, steam; 2210 sq ft, water. SMITH-MILLS BOILERS, Series 15-20-25; capacities 200 to 2275 sq ft steam radiation. This complete line of modern push nipple boilers is available in models for gas, oil, stoker or hand firing. Have provisions for built-in domestic hot water heaters and controls. MILLS WATER TUBE BOILERS, Series 24-34-44; capacities 900 to 13,380 sq ft steam radiation. Independent header type construction. Tens of thousands are installed in schools, hospitals, apartment houses, stores and other commercial anti Eublic buildings. Models for hand and all types of automatic ring. SMITH HY-TEST BOILERS for hot water supply are furnished in several models, and many sizes for tank capaci ties to 20,000 gal. Constructed of the finest quality grey iron castings, these Hy-Test units are carefully tested at ex tremely high pressures before shipment. 42 and 60 SMITH BOILERS, may be used in batteries for ^heating loads up to and over 100,000 sq ft steam radiation. Many of these large units installed in industrial plants furnish steam for processing requirements as well as for heating and domestic hot water. Complete catalog information describing Smith boilers is filed in current issues of Sweet's "Architectural" and Domestic Engineering Catalog Directory. 353