Document 5bb7XrxDjMnpn8QrxzdmgwLoV

Specialties, Heating C. A. Dunham Company General offices: Dunham Bldg., 450 East Ohio St., CHICAGO, ILL. Factories: Marshalltown, Iowa, Michigan Cm, Indiana, U. S. A.. and Toronto, Ont., Canada Eastern Division Offices 101 Park Avenue, New York Foreign Division Offices 101 Park-Avenue, New York (Japan) Uchida Trading Co., Tokyo and New York (China)--except Darien--Pacific Trading Co., Shanghai Western Division Offices 232 Monadnock Building, San Francisco, Calif. SALES OFFICES Albany. N. Y., 304-Home Savings Bank Bldg. Allentown, Pa., 1846 Hamilton St Baltimore, Md., 218 Water SL' Bangor, Maine, 104 Exchange St. Boston, Mass., 10 High St. Buffalo, N. Y., 232.Delaware Ave. Caldwell, Ohio, 827 West St Clarksburg, W. Va., 300 Stealey Ave. Atlanta,-Qa., 809 Forsyth Bldg. Birmingham. Ala., 447 Martin Bldg. Charlotte, N. C., 1815 Queens Road Chattanooga, Tenn., 1201-03 Volunteer Bldg. EASTERN DIVISION Glen Cove, L. I., N. Y.t Glen St. and Hendricks Ave. Harrisburg, Pa., 2216 N. Fifth St Huntington, W. Va., 714-716 Union Bank Bldg. Kingston, Pa., 302 Kingston Corners Bldg. Mt.Vebnon,N.Y., 245 N. Terrace Ave. Newark, N. J,, 972 Broad St SOUTHEASTERN DIVISION Greenville, S. C., 317 Walker Bldg. (P. 0. Box 563) Little Root Ark., 201 E. Markham St CENTRAL DIVISION New Haven, Conn., 42 Church St.. New York, N. Y., 101 Park Ave. Philadelphia, Pa., 1500 Walnut St Pittsburgh, Pa., 3002 Grant Bldg. . Poughkeepsie, N. Y., 50 Market St Providence, R. I., 49 Westminster St Rochester, N.Y., 972 Mercantile Bldg. Stracuse, N. Y., 306 0. C. S. B. Bldg. Trenton, N. J., 219 E. Hanover St Washington^D. C., 327 Munsey Bldg. Memphis, Tenn), 244 Madison Ave. New Orleans, La., 1666 Abundance St. Tampa. Fla., 8304 Semmes Ave., Sulphur Springs Special Sales Office, 450 East Ohio Street, Chicago, C. E. Rotcoe * Akron, Ohio, 225 W. Exchange St Chicago, III, 450 E. Ohio St Cincinnati, Ohio, Des Moines, Iowa, 710 Old Colony Bldg. Detroit, Mich., 2988 E. Grand Blva. Louisville, Kr., 1342 Starks Bldg. Milwaukee. Wib., 1148 Empire Bldg. Minneapolis, Minn., c 1231 Union Trust Bldg. Duluth. Minn., 316 Glencoe Bldg. Cleveland, Ohio, Grand Rapids, Mich., 132 South 10th St Oklahoma Cm, Okla., 430 Terminal Tower Bldg. 425 Murray Bldg. 710 N. Hudson St Colorado Springs, Colo., Houston, Texas, 312 Caroline St 115 E. Washington St Columbus, Ohio, 85 E. Gay St Dallas, Texas, Indianapolis, Ind., 325-326 Board of Trade Bldg. Joliet, III, 724-725 Union State Bank Bldg. St. Louis. Mo., 3605 Laclede Ave. San Antonio, Texas, ' > 408 Dallas Bank & Trust Bldg. 309 Sterling Ave. (P. 0. Box 1086) 3005 Smith-Young Tower Davenport, Iowa, 305 Security Bldg. Denver, Colo., 414 W. Colfax Ave. Kansas Cm, Mo., 615 City Bank Bldg. Toledo, Ohio, 1914 Vermont Ave. Wichita, Kans., 1100 E. Douglas Ave. El Paso, Texas, 401 N. Santa Fe St (P. 0. Box 512) Kauspell, Mont., Whipps Block Los Angeles, Calif., 617W. Seventh St WESTERN DIVISION ' Portland, Ore., 1000 Guardian Bldg. Salt Lake Cm, Utah, 204 DoolyBldg. San Francisco, Calif., 232 Monadnock Bldg. Seattle, Wash., Exchange Bldg. Spokane, Wash., Sun Life Assurance Bldg. C. A. Dunham Co., Ltd., 1523-41 Davenport Road, C. A. Dunham Co., Ltd., (of the United Kingdom) 18 St. Thomas St., London. S.E., 1, England. Toronto, 4, Ont., Canada. Sales Offices: Calgary, Alberta; Halifax, N. S.; Montreal, Que.; Ottawa, Ont; Toronto, Ont; Winnipeg, Man.; `Vancouver, B. C.; Quebec, Que.; St Johns, Newfoundland. Agents: Birmingham, Eng.; Cardiff, Wales; Leeds, Eng.; Liverpool, Eng.; Newcastle-oo-Tyne, Eng.; Glasgow, Scot land; Belfast, Ireland; Paris, France; Munich, Germany; Copenhagen, Denmark; Gothenburg, Sweden; Wellington, New Zealand; Melbourne, Australia; Sydney, Australia. --Z/Pifr-enshal-lbcm J''"Heating System* The Dunham Differential Vacuum Heating System and individual parts of the apparatus used in that system are fully protected by Uoited States Patents Nos. 1,644,144, 1;706,401, 1,727.965, 1,761,819, 1,771,077, 1,792,213, 1.802,383 and 1,802,384 and Canadian Patents Nos. 282,193. 282.194, 282.195, 292,558, 308,943 and 291,134 (British). Additionalpatents in tiie United States, Canada and foreign countries are now pending. Over eighty sales offices in the United States, Canada and the United Kingdom bring Dunham Heating Serv ice as close to you as your telephone. Dunham heating engineers are available for counsel at every one of these offices and the accumulated knowledge of the entire Dunham organization is put at the disposal of the architect or engineer in scientifically and economically laying out any Dunham Heating System. The Dunham Systems of Heating, adapted to different classes or types of building are as follows: The Dunham Differential Vacuum Heating System. The Dunham Vacuum Return Line Heating System. The Dunham Return Heating System. The Dunham Home Heating System. Each of these several designs is a corn- 782 C. A. Dunham Company Specialties, Heating plete two-pipe system, the great efficiency of which is made possible by the use of the Dunham Radiator Trap, which is installed at the return outlet of each radiator or pipe coil, where it stands guard against waste of steam and constantly relieves the radiation of the enemies of heating ef ficiency--air and water. THE DUNHAM DIFFERENTIAL VACUUM HEATING SYSTEM This system is a two-pipe system in The Dunham Differential Vacuum which steam is supplied to the radiators at Heating System prevents this heat waste sub-atmospheric pressures and in quanti which amounts to 25 to 50 per cent of the ties varying with the need for heat. It is steam consumption for the heating season. so designed that a relatively constant dif ference in vacuum is maintained auto matically between the radiators and the return piping (the vacuum in the return ` line'being slightly higher), thereby assuring Heating with Steam of Variable Tem peratures--Cool Steam (133F.) Warm Steam (133 to 212F.) Hot Steam (above 212F.) a circulation of steam to and within the radiators whenever there is demand for heat. It is simple in its component parts, re quiring that: It is generally agreed that there is a large amount of heat wasted in mild weather because buildings are overheated. The cause is that the heating system is operated on and limited in its operation to (1) A properly controlled vacuum pump having capacity to create high vacuums economically be provided. (2) The traps function under vacuums as high as 25 in. pressures above atmospheric, even in mild weather. Steam pressures ranging from a few ounces to 2 or 3 lb. afford but a small operating range of steam temperatures to meet changes in weather conditions. That is, steam at a relatively constant pressure (3) The radiator valves be of the all is usually supplied to the radiators regard metal packless type and be equipped with less of what the outside weather may be. regulating plates having the proper size The heat output of the radiators will there orifice for the amount of radiation. fore be entirely too high in mild and (4) The temperature controlling equip ment be selected to meet the requirements of the individual installation. moderate weather, when only a fraction of the radiation installed would actually be required to balance the heat loss of the building and maintain the desired and The system is flexible in operation re comfort giving room temperature. sulting in comfortable and economical Daily weather reports show that the warmth for occupants in the milder temperature rises and falls quite rapidly months of early Fall and Spring as well as over the greater portion of the country. the extreme cold months of Winter. This Temperature changes of 40 deg. per day is accomplished by increasing the vacuum occur each winter in the Chicago area, (which is synonymous with "cooler steam") while daily changes of 20 deg. are but during the mild weather and by lowering slightly higher than normal. To this the vacuum or if necessary operating under variation in heat demand must be added slight pressure (which is synonymous with the cooling effect of wind, if a true picture "hotter steam") during the extreme cold of the great fluctuations in heating re weather. During very mild weather the quirements is wanted. radiators are only partly filled with steam This statement of the great variation in under high vacuum. weather conditions from day to day is The average system of heating is simply to point out that the ideal in heat ordinarily designed with sufficient radia ing is to have output of the system just tion to heat a building to 70 degrees when equal to the heat loss from the building if the outside temperature is at the lowest for uniform room temperature is to -be main the season. However, since the low or tained and heat waste through overheating minimum temperature is reached or ap is to be eliminated, and the accompanying proached only on a few days during the excessive open window heat loss is to be heating season it follows that the system prevented. __ has too. much heating capacity during the The Dunham Differential Vacuum average weather condition, and since no Heating System accomplishes this without provision is made to vary sufficiently the any complicated or delicate equipment, or temperature of the steam supplied to the any greater variety of appliances than is radiators, the rooms 'become uncomfor used by the ordinary Vacuum Return tably overheated. Line Heating System. 783