Greenhouse construction : a complete manual on the building, heating, ventilating and arrangement of greenhouses, and the construction of hotbeds, frames and plant pits . r than that outside, it will naturallytend upward, and ventilation will be most effective ifprovided at the higliest part of the building. The ven-tilators should be arranged so as to prevent direct draftsof cold air upon the plants. They are sometimes placedon both slopes of the roof, in order that the openingmay be opposite to the direction of the wind. In some houses large ventilators have been placed,at intervals, along t
Greenhouse construction : a complete manual on the building, heating, ventilating and arrangement of greenhouses, and the construction of hotbeds, frames and plant pits . r than that outside, it will naturallytend upward, and ventilation will be most effective ifprovided at the higliest part of the building. The ven-tilators should be arranged so as to prevent direct draftsof cold air upon the plants. They are sometimes placedon both slopes of the roof, in order that the openingmay be opposite to the direction of the wind. In some houses large ventilators have been placed,at intervals, along the roof; but better results are ob- 68 GREEXHOLSE CONSTRUCTION. tained when coiitinuons lines of narrow ventilators onone or both sides of the ridge are nsed. CONTIXUOUS VENTILATION. Wlion a continnons row of ventilating sashes is nsed,a small opening will provide the necessary ventilation ;but, if they are scattered at intervals along the roof, theopenings will need to be two or three times as large, andthe draft of cold air npon the plants will be greatlyincreased. The openings at the ends of the sash inviteside drafts- It is a poor plan to have a continnons row. FIG. 42. ARRANGEMENT OF VENTILATORS. of sashes, only })art oL which are nsed. Particularly iff)n a high roof, where shafting is necessary to workthem, there will be constant trouble from the swellingand sticking of the sash. Although not necessary, thecontinuous Avorking sash may be fastened together withstrips of band iron. VKXTILATIKG SASH. The sash should be nuide in the snme way as hot-bed sash, Avith n thin strip for the lower edge. The yentilating machinery. 69 joints should be located over tlic middle of rafters orsash bars. The glass used for the sash should be of thesame width as for the rest of the honse, except the rowsat either end of each sash, which should be somewhatnarrower, to allow for the increased width of the sidestrip of the ventilating sash. haxginCt the sash. The old method of hanging the sash
Size: 1831px × 1365px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidgreenhouseco, bookyear1894
