Section of Span-Roofed Pit

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A diagram consisting of a section of a span-roofed pit. These pits are useful for plant culture. A, Ordinary Soil; b, Passage; c, Heated Chambers; d, Plunging Beds; e, Hot-Water Pipes.


Nicholson, George The Illustrated Dictionary of Gardening, Div. VI (London, England: L. Upcott Gill, 1884)


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