A practical treatise on the construction, heating and ventilation of hot-houses; : including conservatories, green-houses, graperies and other kinds of horticultural . .The difhculty of effecting a similar distribution of the gas inthe furnace, by means of jets, however, seems alternative alone remains: since the gas cannot be intro-duced by jets into the body of the air, the air might be intro-duced by jets into the body of the gas; and this will be aneffectual remedy. Fig. 33 is a section of Williams furnace for the preventionof smoke. In this furnace, the fu
A practical treatise on the construction, heating and ventilation of hot-houses; : including conservatories, green-houses, graperies and other kinds of horticultural . .The difhculty of effecting a similar distribution of the gas inthe furnace, by means of jets, however, seems alternative alone remains: since the gas cannot be intro-duced by jets into the body of the air, the air might be intro-duced by jets into the body of the gas; and this will be aneffectual remedy. Fig. 33 is a section of Williams furnace for the preventionof smoke. In this furnace, the fuel, as will be seen from thecut, is thrown immediately upon the grate bars, ond throughthem the air finds admission to it for the purpose of consump-tion. The gases pass over the bridge C ; here they meet a cur-rent of air entering just beyond the bridge, which has beenadmitted by the air-tube b, below the ash-pit /, into the air-chamber d, and from thence escaping through a great numberof small apertures in the diffusion plate above. The force with which the air enters through this series ofjets or blow-pipes enables it to penetrate into the gases, and HEATLNG. 149 Fig. loO HEATING. obtain the largest possible extent of contact-surfaces for the airand gases; which is important, since the short time allowed forthe diffusion would otherwise be insufficient, in consequence ofthe rapid passage of the smoke and gases over the diffusionplates; e is the spy-hole for ascertaining the state of the smoke. Fig. 34 is an apparatus invented by Mr. Jeffreys, of Bristol, aslong ago as 1824, for precipitating the lamp-black, metallicvapors, and other sublimated matters from smoke, by washingthe latter by means of a stream of water. Where the necessarysupply can be secured, this plan is both effectual and economi-cal, and well adapted for situations where the presence of smoke,as well as the impurities produced by it, is an annoyance. In the vertical section, B B is the smoke flue. The sm
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