Observations on the ventilation of rooms; on the construction of chimneys; and on garden stoves / Principally collected [by R. Willan] from papers left by the late John Whitehurst.

  • John Whitehurst
Date:
1794
Catalogue details

Licence: Public Domain Mark

Credit: Observations on the ventilation of rooms; on the construction of chimneys; and on garden stoves / Principally collected [by R. Willan] from papers left by the late John Whitehurst. Source: Wellcome Collection.

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    f [ 21 ] ' » Iq fonie rooms where it is not convenient to make a perforation, air may be admitted between the folding of the fafh-frames *, by cutting away about the eighth of an inch from the frame, leaving the whole fubftance at each flyle. This is only practicable when there are fhutters on the outfide, and not on the infide of the window. For by infide fhuttxrs the current of air up- ward is obfhucted; whence it Julies through the crevices i • in various directions, and produces unpleafant effeCts. When rooms are iniefled with fmoke, and cannot be conveniently fupp ied with a current of air from with- out, another expedient for clearing them, is to increafe the rarefaction of the air in the chimney, by contract- ing its opening above the fire-place -}-> as reprefented, fig. i 7, which plan likewife anfwers other ufeful pur- pofes; for when chimneys are too capacious at their * On a plan fomewhat analogous to the above, the wards of St. Thomas® Hofpital were ventilated, under the direction of Mr. Whitehurst. In every fecond window, about an inch and a half of each pane in the bottom of the upper fafli is cut away. A frame of glafs, nearly two feet in width, is fet acrofs the window, retting upon the top of the upper fafh, and fattened to it by hinges. The frame can be moved on the hinges, fo as to make a greater or lefs angle with the window, and by that means admit more or lefs air at pleafure. The air which enters between ihe fatties being directed by the frame toward the ceiling, is diffufed through the ward without any percept ble curr-nt. f This part of the fubje£l has been amply confidered in a work, entitled, 44 A ' 44 practical Treatife on Chimneys,” firft publifhed in the Encyclopedia Bri- iannica, and afterward feparately.—Edinburgh, 1776,