Greenhouses, their construction and equipment . to make an uneven or three-quarter span house. The following advant-ages are claimed for these houses: (i) Theysecure a more even distribution of direct sun-light to all plants. (2) The north span ad-mits indirect light which insures better re-sults than may be secured from a lean-tohouse. (3) The heat is more evenly distri-buted than in a lean-to house. They areoften used in growing roses and other plantsrequiring a maximum of light. The con-struction of uneven span houses has beenvaried from time to time, the general ten-dency being to lower th
Greenhouses, their construction and equipment . to make an uneven or three-quarter span house. The following advant-ages are claimed for these houses: (i) Theysecure a more even distribution of direct sun-light to all plants. (2) The north span ad-mits indirect light which insures better re-sults than may be secured from a lean-tohouse. (3) The heat is more evenly distri-buted than in a lean-to house. They areoften used in growing roses and other plantsrequiring a maximum of light. The con-struction of uneven span houses has beenvaried from time to time, the general ten-dency being to lower the north wall to ap-proximately the height of the south arrangement insures even better distri-bution of light and does away with the neces-sity of elevated benches. Uneven span houses are sometimes usedfor growing lettuce and other vegetables di-rectly on the ground instead of in benches,especially on sloping locations. Moderngreenhouses are so much lighter than theolder types that the advantages of the un- GREENHOUSE ARCHITECTURE 55. 56 GREENHOUSES even span house in this connection are hard-ly worth considering. They are much lesscommonly built than formerly. Uneven spanhouses are sometimes constructed with theshort span to the south with a pitch of 40degrees or more. This brings the roof morenearly at right angles to the suns rays, buthas little or nothing to recommend it. Ridge-and-Furrow Houses.—A ridge-andfurrow house is in reality simply two or morehouses joined together. They may be evenspan or uneven span so long as the side wallsare of equal height. The advantages of thisform of construction may be mentioned asfollows: (i) They are less expensive to buildthan separate houses of similar size, on ac-count of the saving in side walls. (2) Notonly is there a saving in the number of sidewalls, but the interior walls may be of cheapconstruction or may be left out entirely, theweight of the roof being supported by postsalone. (3) Considerable saving is made in la
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