. Farm implements, and the principles of their construction and use; an elementary and familiar treatise on mechanics, and on natural philosophy generally, as applied to the ordinary practices of agriculture ... Fig. 190. regarded as incurable. Fig. 190 is intended to show the mode ofits operation, the wind, as shownby the arrows, being deflected fora considerable distance on the leeside, so as to form a vacancy ata, which the wind from the other end and from thechimney both rush in to supply. Being fixed on with-out turning in the chimney, it is both simpler and lessnoisy than any caps furnis
. Farm implements, and the principles of their construction and use; an elementary and familiar treatise on mechanics, and on natural philosophy generally, as applied to the ordinary practices of agriculture ... Fig. 190. regarded as incurable. Fig. 190 is intended to show the mode ofits operation, the wind, as shownby the arrows, being deflected fora considerable distance on the leeside, so as to form a vacancy ata, which the wind from the other end and from thechimney both rush in to supply. Being fixed on with-out turning in the chimney, it is both simpler and lessnoisy than any caps furnished with a vane. Emersons Chimney-cap, lately invented, is differ-ent in construction, but quite similar inprinciple to the preceding. It is shownby Fig. 191. A sheet-iron pipe is set inthe top of the chimney, furnished withthe conical rim, and a plate or fenderon the top which excludes the rain. Be-tween the plate and rim is a space Fig. quite simi-lar in form or section tothat represented by In exposed situations,chimneys are found todraw more uniformly bycontracting the top abouta third less than the restof the flue. The currentat the moment of escapeis swifter than below, andless acted upon by anydownward check from the Fig. 192.
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Keywords: ., bookcentury1800, bookdecade1850, bookpublishernewyo, bookyear1854
