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72 



The Weekly Florists^ p.eview» 



Dbcbmbbb 30, 1909. 



(ireenhonse Beating. 



GAS OR COAL. 



Can you, or some of the readers of the 

 Keview, tell me the relative value of 

 natural gas at 4 cents per thousand cubic 

 feet for heating greenhouses, compared 

 with soft coal at $2 per ton? I am con- 

 templating building a vrholesale plant 

 and any information -will be appreciated. 



J. W. D. 



The natural gas would be found far 

 more economical than soft coal at the 

 prices mentioned, especially as there 

 would be a large saving in the care of 

 the heating plant. 



HEAT FOR VEGETABLE HOUSE. 



We have a house 14x60, eight feet to 

 the ridge and five feet to the eaves, with 

 two feet of boards in the sides, lined, 

 and three feet of glass. The ends are 

 glass, except two feet at the bottom, 

 which is boarded and lined. We intend 

 to grow vegetables in beds on the 

 ground. Please let us know how many 

 lines of pipe will be required to heat this 

 house to 45 degrees. We wish to use 2- 

 inch pipes, hanging them on the posts 

 along the sides of the house. Our tem- 

 perature here, in northern Maryland, 

 rarely goes below 10 degrees above zero. 



R. H. L. 



To heat the house described to 45 de- 

 grees, f.bout 300 square feet of radiation 

 will be required, but it will be well to 

 have a boiler with a rating of 450 square 

 feet. For radiating surface, a simple 

 method will be to run one 2^ -inch flow 

 and three 2-inch returns on each wall. Or, 

 if it is desired to use nothing but 2- 

 iuch pipe, it will answer if two flows 

 nnd six returns are used in the house. 



PIPING IN WESTERN NEV YORK. 



Kindly tell me what is the cheapest and 

 most efficient way to heat one house with 

 hot water. A temperature of 56 degrees 

 is wanted, in an outside tefnperature of 

 15 degrees below zero. The house is 

 .32x200 feet, fifteen feet to the ridge and 

 four and one-half feet to the eaves. It 

 is a separate house, with a 2-foot cement 

 wall .and two and one-half feet of glass 

 in the side walls, which are solid and 

 eight inches thick. The east gable is pro- 

 tected by a connecting house; the west 

 gable is not protected. The land has a 

 fall of about two feet from west to east, 

 toward the boiler, and the boiler is placed 

 in a cellar seven feet deep. The main 

 flow and main return must travel about 

 thirty-five feet through a connecting 

 house; this is the distance from the 

 boiler to the center of the house in ques- 

 tion. 



I wish to use 2-inch pipes. Please 

 state how many are needed. Where should 

 be the highest point of the flows, at the 

 farther end of the house or near the 

 boiler? A 100-gallon expansion tank 

 stands fifteen;! or sixteen feet above the 

 top of ,t]^e boiler. I have a large 

 Kroeschejl generator. A. J. P. 



iJTo heat a house 32x200 feet to 56 de- 

 grees in weather 15 degrees below zero 

 will require about 3,000 square feet of 

 radiation. To furnish this, using 2-inch 

 pipes, it wiU be necessary to put in 

 twenty-four, of which one-half should be 

 flows. It will simplify matters, however, 



What'sThis? 



lt*s the New 



Perfection 



Flue Cleaner 



and we want to send it to you for 

 30 days' FREE trial. 



The Perfection will clean welded 

 flues as well ae old oneg ; re- 

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 can be operated by flexible 

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The knives are always sharp. 

 Heads are drop steel forgings. 

 Hundreds now In use by florists. 



ScflUy Steel & Iron Co. 



Halsted and Fulton Sts., Chicago Jll. 



Mention The Review when you write. 



if eight 21/^ -inch flows and fourteen 

 2-inch returns are used. If a large heater 

 is used, it would answer if there are only 

 seven 2% -inch flow pipes. 



When the houses are so located that it 

 is feasible to give the flow pipes a slight 

 fall, it is possible to connect the expan- 

 sion tank with the highest point in the 

 flows, which will be at the end nearest 

 the heater, and this is recommended in 

 the present case. If this cannot be done, 

 it will be necessary to place an air valve 

 at the highest point in the flows. To 

 connect the boiler with the piping in the 

 houses, it will be well to use two 4-inch 

 flow pipes and the same for the returns. 



THE HIGHEST POINT. 



In the matter of heating with hot 

 water, I have always supposed and been 

 taught to believe that the highest point 

 and expansion tank should be at farthest 

 point from the boilers. I now see in the 

 catalogue of a prominent firm in that 

 line a statement that the highest point 

 should be over the boiler. Will you 

 please give me the facts in the case? 



J. J. T. 



It is always advisable to have the 

 highest point in a hot water heating 

 system at the end of the house nearest 

 the boiler. While it will make little dif- 

 ference in cases where the return pipes 

 are several feet above the top of the 

 heater, the advantages of this method of 

 piping are quite marked when the return 

 pipes are on a level with, or below the 

 top of the boiler. 



The circulation in a hot water system 

 is due to the unequal weight of the water 



We will Bend you by expreBB, all charges 

 prepaid, a one pound can of 



Tripp's Pipe Joint Compound 



Ground in Boiled Linseed Oil, ready to 

 use, and a one pound package of 



Tripp's Iron Repair Cement 



The Alan H. Tripp Co. 



860 S. Clark Street, CHICAGO 



Mention The Review when you write. 



Leai^s Ruin Stoci^ 



Don't Have Tiiem 

 Dor Emergency Pipe Clamps 



are made of malleable Iron and are 

 Cniaranteed to make QUICK, SURE RE- 

 FAIRS of all splits or rust holes on pipe. 



Send for catalogue. 

 Pipe Repairs and Steam Specialties 



JAMES McCREA & CO. 



Manufacturers 

 558-560 Washingtoa Blvd. CHICAGO 



Mention The Review when you write. 



SMITH, UNEAWEAVER & CO. 



COAL 



iBthraclte, BitiBliiosi* Cok« ami flas Goal 



xraYt*S*uf,S?n«. Philadelphia 



Mention The Review when you writ e. 



in the opposing columns. One of these 

 contains the water from the bottom of 

 the boiler, to the highest point in the 

 system, in what we may call the flow or 

 warm side, while the other is filled with 

 the water betweeu the highest point and 

 the heater in what may be considered the 

 return, or cooling portion of the system. 

 The closer the highest point is to the 

 heater, the warmer the water will be, as 

 it will have had less opportunity to cool , 

 off ; hence, since the weight of water les- 

 sens as the temperatttre increases, and 

 increases as the temperature becomes 

 less, the shortening of the distance be- 

 tween the heater and the highest point in 

 the system tends to increase the difference 

 in the weight fat the water in the flow 

 and return systems and hence to hasten 

 the circulation. 



The circulation of the water in a hot 



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