Greenhouses, their construction and equipment . Fig. 51.—Struc-tural steel postwith boardwall FRAMEWORK 91 a quarter-inch pipe and should be supportedby posts every 8 feet. PurUn posts are usual-ly of one and a half-inch pipe and braces ofone and a quarter-inch pipe. A well-built house of this type, if wellcared for, should last a Fig. 52.—Section of truss-frame greenhouse. The frameis made of gaspipe Semi-iron frames are also made from struc-tural iron instead of pipe. They are just assatisfactory, but are not so easily worked,and are usually cut and fitted at the factory. All-meta
Greenhouses, their construction and equipment . Fig. 51.—Struc-tural steel postwith boardwall FRAMEWORK 91 a quarter-inch pipe and should be supportedby posts every 8 feet. PurUn posts are usual-ly of one and a half-inch pipe and braces ofone and a quarter-inch pipe. A well-built house of this type, if wellcared for, should last a Fig. 52.—Section of truss-frame greenhouse. The frameis made of gaspipe Semi-iron frames are also made from struc-tural iron instead of pipe. They are just assatisfactory, but are not so easily worked,and are usually cut and fitted at the factory. All-metal Frame Houses.—There are threetypes of all-metal framework: (i) Those inwhich the roof is supported by interior posts,much the same as in the wood or semi-ironhouses. (2) Those in which the roof is sup- 92 GREENHOUSES ported by a truss work, thus doing away withall interior posts (sometimes known as truss-frame). (3) A combination of the aboveforms (known as a combination truss-frame)is used in houses so wide as to make thetruss-frame impractical. This is commonlyused in houses over 40 feet in width.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkorangejuddc
