Caption: War Publications - WWI Compilation 1923 - Article 45
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s OUCULAS No. 215 Fus. 4. K088-8ICTI0N OF A SURFACE HOTBED The Bame kind of frame as described for the pit hotbed will 6 also for I BUrfaoe bod. Tho north side of the frame is sometimes made of wider boards than the south side, so that the bottom of the frame may be set practically on the level. In a surface hotbed the frame is Bearcely over placed on any supports other than the manure. A cross-- ction of a surface hotl I is shown in Fig. 4. COLD FRAMES Cold frames are like hotbeds except that they have no artificial heat of any kind. They are used chiefly for "hardening off" plants grown in the hotbeds or greenhouses before transplanting them to the open. They are covered with glass sash early in the season, but for use in the late spring, muslin or canvas covers fastened to rollers will be found convenient, cheap, and serviceable. A canvas-covered cold frame is shown in Fig. 5. FIG. 5.—CLOTH-COVERED • OOU> I«V\ME M' I'll i" ( rowing of plants in hotbeds and cold frames is discuss*' ireulars 198 and 216 of this station. ' <J 1
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