File:Greenhouses, their construction and equipment (1917) (14796349903).jpg

Identifier: greenhousestheir01wrig (find matches)
Title: Greenhouses, their construction and equipment
Year: 1917 (1910s)
Authors: Wright, W. J. (William Joseph), b. 1881
Subjects: Greenhouses
Publisher: New York : Orange Judd Co.
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation

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e basement, or it maybe buried in the ground below the frost line.There is little danger in its use if it is pro-vided with a pressure gauge and safety valve. Capacity of Storage Tanks.—The capac-ity of storage tanks is not difficult to arriveat by simple mathematics, unless they are 238 GREENHOUSES of unusual shapes. For convenience, tablesare given below showing the capacity ofround and square tanks of standard sizes.When pneumatic tanks are used, about athird of their capacity is occupied by thecompressed air. TABLE SHOWING CAPACITY OF ROUNDSTORAGE TANKS Diameter Height Capacity Diameter Height CapacityFeet Feet Gallons Feet Feet Gallons 4 4 378 5 6 735 4 5 470 5/2. 8 1400 4 6 567 6 2 423 4 8 756 6 2/ 528 5 3 440 6 3 635 5 4 588 6 4 845 5 5 735 6 5 1056 TABLE SHOWING CAPACITY OF RECTANGULARTANKS Width Height Length Capacity Feet Feet Feet Gallons 2/ 2/ 8 378 3 2 8 360 3 2 10 448 3 / 8 448 3 2/ 10 565 3 3 10 673 4 2 8 478 4 2 10 598 4 2/ 8 598 4 2/2 10 748 4 3 8 718 IRRIGATION 239
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240 GREENHOUSES IRRIGATIONThere are two general methods of water-ing greenhouse crops aside from hand water-ing. One is by an overhead sprinkhng sys-tem ; the other is by an underground or sub-irrigating system. Of these the overheadsystem is by far the more popu-lar. A census of a large numberof growers of greenhouse vege-tables shows that practically 75per cent, use some form of over-head irrigation, while only twoout of the whole number con-sulted were using sub-irrigation.Practically the only system ofoverhead irrigation used ingreenhouses is one in whichpipes, fitted with nozzles whichFig. 125 — A throw a rain-like spray, are run type of nozzle . ,-, - r ^i u j used in over- lengthwise of the house and sohead irrigation arranged that they may be rotat-ed to throw the spray on both sides of the pipeline. The original system is known as theSkinner system, but there are others nowon the market. Pipe lines for this systemshould be about 16 feet apart and as far fromthe foliage as p

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