The Florists^ Review 



OCTOBBB 25, 191T. 



GreenhoDse Heating. 



HEAVIER COAL PRODUCTION. 



In spite of the fuel famine, the Sep- 

 tember production of bituminous coal is 

 estimated at 43,573,652 net tons, accord- 

 ing to a statement issued by the United 

 States Geological Survey. Although the 

 total output -was smaller in September 

 than in August, the rate of production 

 increased from 1,737,685 tons per work- 

 ing day in August to 1,793,154 tons in 

 September. The total production from 

 January 1 to September 30, 1917, was 

 approximately 407,370,011 tons, an in- 

 crease of 38,684,232 tons over the pro- 

 'duction for the corresponding nine 

 months of 1916. The soft coal mines of 

 the country continue to produce in ex- 

 cess of last year's output, but the rate 

 of increase over the production in 1916 

 is slowing down. During the month of 

 August the 1917 production gained 

 4,000,000 tons over the corresponding 

 1916 production. During September the 

 gain was only 1,500,000. Expressing 

 the same idea in terms of percentage, 

 by the end of August the 1Q1,7 produc- 

 tion was 11.1 per cent ahead of that for 

 1916; by the end of September it was 

 only 10.5 per cent ahead. It seems in- 

 creasingly probable that the total pro- 

 duction of the year 1917 will better the 

 record of last year by not more than ten 

 'per cent. The trouble lies in that the 

 consumption of fuel has increased con- 

 siderably faster than the production. 



DEFECTS IN PIPING. 



I haVe a small show houSe whitfh is 

 so situated that it must, be heated in- 

 dependently. Last winter I had trouble 

 in getting the desired temperature, 50 

 degrees in zero weather, and I thought 

 that perhaps the house is not piped 

 heavily enough. Will you kindly tell 

 me how to remedy the trouble? As in- 

 dicated in the enclosed sketch, the 

 show house is in the form of a lean-to 

 and is attached to the south side of a 

 building 20x25. The house is 13x24, 

 with three feet of wooden wall and two 

 and one-half feet of- glass at the south 

 side. The east and west ends are all 

 glass except the lower three feet of 

 wooden wall. The ridge is twelve feet 

 high. 



I am using a Wilks boiler, rated at 

 550 feet; so the trouble, of course, is not 

 there. A 2-inch flow pipe rises about 

 four feet above the boiler, and then 

 runs south to the purlin in the center of 

 the house and west to the end, where it 

 drops and is divided to feed six 1^4- 

 inch returns under one bench and four 

 1^/4 -inch returns under the other bench. 

 The lowest point of the returns is about 

 level with the top of the boiler. The 

 expansion tank is connected with the 

 highest point of the flow and is about 

 two and one-half feet above it. That is 

 as high as the tank can be placed. 



W. F. M.— Mo. 



If the piping has been properly in- 

 stalled, the amount of radiation should 

 be sufficient to furnish a temperature 

 of 50 degrees. We judge that the dif- 

 ficulty may be ascribed to two causes, 

 the principal one being that the re- 

 turns are but little above the boiler. 

 If this could be corrected, the other rea- 

 son for the poor circulation — which is, 

 that we should not attempt to supply 

 ten 114-iiich returns with one 2-inch 



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