. The book of the garden. Gardening. 278 VENTILATION. others, is to guard against excess of heat in the absence of the gardener. It is thus described in the " Gardeners' Magazine," vol. i. p. 419 :—The movement" is effected by the expansion and contraction of air in an air-tight vessel a, communicating with a cylinder and piston bed, which, by means of a rod g, operates on the ven- tilator, or sash, to be opened. The use of the water, or other fluid, is to confine the air ; and by that means, when the air expands or contracts, it operates upon the piston. By means of an adjustin
. The book of the garden. Gardening. 278 VENTILATION. others, is to guard against excess of heat in the absence of the gardener. It is thus described in the " Gardeners' Magazine," vol. i. p. 419 :—The movement" is effected by the expansion and contraction of air in an air-tight vessel a, communicating with a cylinder and piston bed, which, by means of a rod g, operates on the ven- tilator, or sash, to be opened. The use of the water, or other fluid, is to confine the air ; and by that means, when the air expands or contracts, it operates upon the piston. By means of an adjusting screw f, the register may be made to open at any required degree of heat. The air vessel a should contain several gallons, according to the size of the valve, or re- gister, to be opened. When first used, the vessel must be heated sufficiently to expand the internal air ; water is then to be poured in at the top of the cylinder c, so as to give the required motion to the float j and about half-inch of fine oil must be laid on the top of the water to prevent ; The proper situa- tion for the vessel to be placed in is in front of the upper part of the top wall, where it may be fully exposed to the greatest heat of the house. " If the apparatus," Mr Wil- liams says, " is of proper size, nicely con- structed, and filled with a proper quantity of water, the registers—one being placed in the upper part of the back wall for the es- cape of heated air, and the other near the floor of the house for the admission of cold air—will open and close again several times during the course of the ; Mr George Mugliston of Repton about the same period invented a self-acting ven- tilator, but upon a smaller scale. Mr Syl- vester and Dr Ure also applied themselves to the same task. MrKewley,so well known for his successful modes of heating by hot water, invented a self-acting machine for this purpose, of which an excellent figure and clear description
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
