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120 



The Florists' Review 



March 30, 1016. 



rtr COAL wrile to 



MITCHELL & DILLON 

 COAL CO. 



Bedford Building. CHICAGO 



W« can sav* yu nonay. 



Maaaoa 111* BwTtow wtwn yea wrlt». 



n. H. UNEAWEAVBi & CO.. lac 



*Tr" e O A L 



BITUMINOUS %# \0 #% ■■ 

 West End Trust Buildins. PHILADELPHIA 



17 Battery Place. NEW YORK 



Nnttins Building. LEBANON. PA. 



M— tl— Th* Hrtew wh— y write. 



Greenhouse Heating. 



WATER BOILS OVEB. 



Last fall I installed a hot water 

 boiler to heat about 800 feet of 2-inch 

 pipes. As the greenhouses are located 

 on a hill and the boiler shed is at the 

 foot of the hill, I had to put the ex- 

 pansion tank on the highest point of 

 the greenhouses, attached to the main 

 feeding pipe. Everything works satis- 

 factorily until the water gets quite 

 hot; thjen it escapes through the expan- 

 sion tank instead of returning to the 

 boiler. Could I use a closed tank in- 

 stead of an open one and would that 

 prevent the loss of water, or is there a 

 better way to remedy the trouble! 



C, A. D.— Ohio. 



Judging from the description given, 

 it w6uld appear that the simplest way 

 to correct the difficulty would be to use 

 a closed system, or to attach a mercury 

 generator to the pipe leading to the 

 expansion tank. However, if the size 

 of the boiler and the number and size 

 of the heating pipes are properly ad- 

 justed, there should be no serious 

 trouble from this cause. If C. A. D. 

 will furnish a more definite description 

 of the system, with the capacity, or at 

 least the grate area, of the boiler, and 

 the number, size and arrangement of 

 the pipes, we may be able to offer some 

 suggestions which will lessen the tend- 

 ency to "boil over." 



STEAM FOB THBEE HOUSES. 



Will you kindly tell me how many 

 feet of radiation will be needed in 

 three houses, each 25x84 and twelve 

 feet high to the ridge T The sides are 

 four and one-half feet high and con- 

 tain two feet of glass above two and 

 one-half feet of wooden wall. The east 

 ends of the houses are exposed; the 

 west ends are protected by a lean-to. 

 Will a 25-horsepower, low-pressure, re- 

 turn tubular steel boiler heat these 

 houses to a temperature of 55 degrees? 

 The outside temperature here seldom 

 drops to 10 degrees below zero. I ex- 

 pect to use a gravity system for the 

 returns. C. F. B.— Ohio. 



If each of the houses has two feet 

 of glass in each side wall, we would use 

 one 2-inch overhead supply pipe, run- 

 ning to the farther end of the house, 

 and connect it by means of l^^-inch 

 pipes with two coils, each containing 

 five 1^-inch returns, on the side walls, 

 or a part of them might be under the 



WILKS SELF-FEEDING 

 HOT WATER BOILER 



For ECONOMY 

 DURABILITY 

 DEPENDABILITY 



Install a 



WILKS 



and forget your troubles 



NO NIGHT FIREMAN REQUIRED with 

 the WILES SELF-FEEDING BOILERS, 

 as the magazine or coal chamber holds 

 sufScient fuel to keep fire 10 to 12 hours 

 without attention. Best made for a small 

 greenhouse. 



Sand for catalogu* amd pricat. 

 TXLXFHONX TARD8 800 



S. Wiiks Nfg. Co. 



3523 Shields Avenue 

 CHICAGO, ILLINOIS 



Mention The Review when yon write. 



Mention The Review when yuu wnte. 



benches. Nine returns would answer 

 if but one wall is exposed. There will 

 be less than 500 square feet of radia- 

 tion in each house and there should be 

 no difficulty in maintaining the tem- 

 perature desired with a 25-horsepower 

 boiler, although if a little larger boiler 

 were used it would require less atten- 

 tion. 



ABOUT MEBCUBY QENEBATOBS. 



Please inform me in what way mer- 

 cury is used to put water under pres- 

 sure. Do we get more heat from the 

 pipes when the extra pressure is thus 

 applied! Will water heat more quickly 

 when fresh than it will after being in 

 the pipes for several months? 



S. D.— Me. 



There are now on the market several 

 mercury generators, or circulators. They 

 are connected with the pipe leading to 

 the expansion tank, and result in plac- 

 ing the water in the system under pres- 

 sure. 



In an open hot water system, when 

 the expansion tank is practically at the 

 level of the piping, the water will be 

 under the ordinary atmospheric pressure 

 and will boil at 212 degrees, but if the 

 expansion tank is elevated thirty-four 

 feet the pressure will equal two atmos- 

 pheres, or thirty pounds per square 

 inch, and under that pressure water 

 will not boil until it reaches 251 de- 

 grees, or 39 degrees higher than in an 

 open tank system. Mercury is 13.6 

 times as heavy as water; hence, instead 

 of using a column of water thirty-four 



"Superior 



INTERNAL-FIRED 

 BOILER 



F«r Hot Water HMtlns 



yj 



Superior Hichine & B«3er Works 



S40.880 W. Superior Str««t 

 CHICAGO 



Mention Th» n»Tl#>w wh#n von wHt*. 



0" 



ale 



^ 



BOILER FLUES 



We make a specialty of handling; 

 carefully selected Boiler Flues, 4-in. 

 diameter and other sizes, for green- 

 house pipingr.Gutter Posts, etc. Also, 

 we make a specialty of flues for 

 retubing: boilers. All fluet are 

 thoroug:hly cleaned inside and out, 

 trimmed, and are ready for use. 

 General Sales Arents for Stuttle's 

 Patent Clamp and Elbow for joining: 

 flues— no packing;, no leaks. New 

 standard pipe and all kinds of green- 

 house fitting:s. Right prices and 

 prompt shipment. 



H. MUN SON 



Est. 1898 Phone Superior 572 

 1353 N. Clark St., Chicagro 



% 



O 



^ 



:0 



Mentloa The Review when yon write. 



feet high in order to secure an addi- 

 tional pressure of fifteen pounds, it 

 may be obtained by substituting a col- 

 umn of mercury thirty inches high. 

 This will make it possible to add 30 de- 

 grees to the temperature of the water 

 in the system, and the efficiency of the 

 radiating surface will be increased to 

 that extent. 



However, this does not imply that 

 the efficiency of a given heating plant 

 will be increased to that extent by 

 merely placing the water under pres- 

 sure by means of a mercury generator, 

 or some similar device. The word "gen- 

 erator" is a misnomer, since the mer- 

 cury apparatus does not generate heat. 

 It merely makes it possible for the 

 water to absorb and distribute a greater 

 amount of heat, and before this can be 

 d6ne we must provide a boiler of suffi- 

 cient heating capacity and must fur- 

 nish an adequate amount of fuel from 

 which the heat may be generated. From 

 the fact that the water in a closed sys- 

 tem may be heated to a higher tem- 

 perature than in an open system, we 

 can, of course, get more heat from it. 

 This makes it possible to reduce the 

 amount of radiation required, as com- 

 pared with an open system. 



As to the question whether water 



