This section is from the book "Spons' Mechanics' Own Book: A Manual For Handicraftsmen And Amateurs", by Edward Spon. Also available from Amazon: Spons' Mechanics' Own Book.
Fig. 618 illustrates the construction of a greenhouse with a span roof 20 ft. wide, as recommended by E. Luckhurst in the Journal of Horticulture. Following are the details: -
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