. The book of the garden. Gardening. 552 DETAILS OF CONSTRUCTION. external coverings, if properly applied, effect a saving of nearly nine-tenths of the fuel, and that a better and more certain temperature is maintained even when the thermometer sinks to from 15° to 24° of frost, Reaumer—that is, below zero by Fahrenheit's scale. All coverings, to be most effective, should be impervious to water, and of non-conducting materials. The following description and illustra- tion, fig. 788, will explain a method of Fig. covering span-roofed hothouses much used throughout the north of Europe ; no
. The book of the garden. Gardening. 552 DETAILS OF CONSTRUCTION. external coverings, if properly applied, effect a saving of nearly nine-tenths of the fuel, and that a better and more certain temperature is maintained even when the thermometer sinks to from 15° to 24° of frost, Reaumer—that is, below zero by Fahrenheit's scale. All coverings, to be most effective, should be impervious to water, and of non-conducting materials. The following description and illustra- tion, fig. 788, will explain a method of Fig. covering span-roofed hothouses much used throughout the north of Europe ; nor is it span-roofed houses alone that are thus covered, but lean-to houses also, as well as pits of every description. The cov- erings formerly used were wooden shutters and straw mats set in frames ; but felt is now common, making not only a much more economical, but, at the same time, more convenient kind of covering, a is a section of a rafter constructed for this purpose, in which b b are the glass sashes; c c the felt or other covering made into frames the exact size of the sashes, and put on every evening during winter, and removed again in the morning, unless the weather is exceedingly cold, and much snow has fallen; d another section of a rafter for the same purpose, the fastenings of the shutters being rather different; e e the sashes as before, and // the covering, which in this case is not kept down by the coping as in a, but the top ends of the shutters run under the coping of the ridge at g, and the bottom part is secured by a button on top of the rafter in a variety of ways, which will suggest them- selves to the intelligent gardener. A pro- vision is made for closing in the space between the bottom rail of the shutter and the top of the bottom rail of the sash, by a piece of wood suited to the purpose. This is intended to prevent too much cold air entering between the shutters and the lights, or rather to keep such air in a quies- cent state—a precaution ve
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
