The hand-book of household scienceA popular account of heat, light, air, aliment, and cleansing, in their scientific principles and domestic . ing to the unsteadiness of |the currents, the valve is constantly vibrat-ing or trembling, and would bo noisy butthat it is made to strike against soft ^^^^,___leather. A modification of this valve Amotts Yaive. consists of a square piece of wire gauze set in the opening, with a cur-tain of oiled silk susj^nded behind it. The current into the chimneypushes back the pendant flap, while a reversed current drives it againstthe gauze, and thus
The hand-book of household scienceA popular account of heat, light, air, aliment, and cleansing, in their scientific principles and domestic . ing to the unsteadiness of |the currents, the valve is constantly vibrat-ing or trembling, and would bo noisy butthat it is made to strike against soft ^^^^,___leather. A modification of this valve Amotts Yaive. consists of a square piece of wire gauze set in the opening, with a cur-tain of oiled silk susj^nded behind it. The current into the chimneypushes back the pendant flap, while a reversed current drives it againstthe gauze, and thus closes the aperture against the admission of fire-fumes and smoke. These are easily placed m fire-boards used to closethe fronts of chimneys. 356. Importance of Arnotts Valre.—The value of this valve to thepublic can hardly be exaggerated. Mr. Tredgold expressed whatmany have felt, when he said that all the plans he had seen or read otfor drawing off the air from the top of a room are objectionable, eitherfrom being wholly inefficient or from causing the chimney to valve first meets the difficulty. It is cheap, easily tuserted, may Fig,. 200 AREANGiafENTS FOE VENTILATIOTf. be manngecl Avith trifling care, and drains the room effectively of itsgaseous pollutions. In the thousands of stifling, stove-heated rooms,where palor of countenance, headache, and nervousness, bear painfulwitness to the perverted and poisoned state of the air, this simple me-chanical contrivance might bring happy relief. It is much used inEngland, but has not been made suflBciently known in this have inquired for it in vain at many establishments. It is manu-factured by S. B. James & Co., 77 White street—price, $2 50 to $5,according to size. If the orifice in the chimney be deemed unsightly,it may be screened from view by placing a picture before it. 357. Chimney Curreiits inSninnier.—The air in the chimney is usuallysomewhat warmer than the external air, even when there is no f
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectfood, booksubjecthome
