A practical treatise on chimneys : containing full directions for preventing or removing smoke in houses. ... / [James Anderson].

  • James Anderson
Date:
1777
Catalogue details

Licence: Public Domain Mark

Credit: A practical treatise on chimneys : containing full directions for preventing or removing smoke in houses. ... / [James Anderson]. Source: Wellcome Collection.

    91/102 (page 73)
    It is almoft fuperfluous to obferve, that the fame effeds will be produced, by opening or doling a prefs-door within the room, as by opening the room-door, in a ftill higher degree, in proportion to the fize of the door of the prefs. It is likewife fufficiently obvious, that when any perfon moves through a room, the air mud be difplaced by the body of that perfon, fo as to pro¬ duce an effied of the fame fort, in proportion to the fize of the body :«—-for when one moves to¬ wards the fire-place, a quantity of air is pufhed before his body towards it, and forced up the chim- ney ;—-but when he retires from it, a proportional quantity is drawn down the chimney to fupply the vacuum left by the retiring body; In a fmall room, the fize of a human body bears fuch a proportion to the whole contents, and all the motions mud necelfarily be * ib near the fire¬ place, that it is hardly poflible for a bulky perfon to move about in it quicker than a (nail, without didurbing the fudion of the chimney, and occa- fioning puffs of fmokebut in a large apartment, a perfed freedom of motion is allowed to every perfon in it without the final]ed danger of pro¬ ducing any of thefe difagreeable effeds. * r. ^ 1 * 1 On thefe. accounts, were there no other reafons for it, thofe who wifii. to live comfortably in their iioufes, ought with care to avoid fmall rooms. Blit