

92 



The Weekly Florists' Reviewt^^ ^ 



Septbmbbb 28, 1911. 



the others can be distributed under the 

 wide benches. A boUer rated for 1,000 

 square feet of radiating surface is 

 about what is needed and one of 3,050 

 feet of radiation will be much larger 

 than can be used economically, unless 

 additional houses are to be added later. 

 The expansion tank should hold any- 

 where from five to ten gallons and 

 should be connected with the highest 

 part of the flow pipe. 



PIPING IN SASKATCHEWAN. 



We have a small greenhouse, run- 

 ning east and west, which we wish to 

 heat to grow lettuce and general mar- 

 ket crops. The house is 12x100 feet 

 and nine feet from path to ridge, with 

 8-foot rafters. The walls are three 

 feet high and are built of two-ply 

 lumber. The beds will be solid. The 

 temperature required will be about 50 

 degrees, with the outside temperature 

 possibly as low as 60 degrees below 

 zero, as we are located in central Sas- 

 katchewan, Canada. There are two 

 doors in the house, one at each end; 

 the one at the west end is closed all 

 winter. We expect to put the boiler 

 house at the east end. Kindly inform 

 us as to the best manner of piping and 

 the amount required. J. C. K. 



Having had no experience in the 

 heating of greenhouses in a tempera- 

 ture of 60 degrees below zero, the 

 answer will necessarily be largely 

 theoretical. The use of four 2i^-inch 

 flow pipes and twelve 2-inch returns 

 is suggested. One flow could be placed 

 upon each plate and the other a foot 

 or so below the ridge. Four returns 

 can be upon each side wall and the 

 others in two coils in the middle walk, 

 if there is one. In case there is no 

 place other than upon the walls, for 

 the returns, they can be placed there 

 and the flow pipes can be arranged as 

 suggested. 



SETTING A BOILEB. 



I should like to ask whether there is 

 anything gained by having eighteen to 

 thirty inches of space under a boiler. 

 Our boiler is a common steam boiler, 

 sixteen feet long, with fifty 4-inch flues. 

 It is set ten inches above the pit floor 

 and the ash and grate pit is dug deeper. 

 We are told that a boiler should be 

 set two feet above the bottom of the 

 pit and that a brick wall should be 

 built to within ten inches of the boiler, 

 at the end of the grate. Does this 

 empty space at the back of the grate 

 serve any purpose, except to contain 

 the ashes and save cleaning so often t 

 We use a hot water system. We are 

 also told that there should be a cham- 

 ber three feet wide at the end of the 

 boiler, where the smoke enters the 

 flues. Our flue door is eighteen inches 

 from the end of the boiler, which gives 

 ample room for the smoke to enter the 

 flues, if that is the only duty this space 

 is to perform. J. T. 



While it is not essential that the 

 space under the boiler, toward the rear, 

 be as much as thirty inches, it would 

 seem that rather more than ten inches 

 would be desirable. The reason for 

 having a space of thirty inches is that 

 it is usually the same as on the other 

 side of the bridge, where a depth of 

 thirty inches is required for the flre- 

 box and ash-pit. Eighteen inches of 

 depth at the rear of the bridge would 



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