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.

    15/60 (page 13)
    [ *3 ] Let us next confider the confequences arifing from two chimneys in one and the fame room, as at C F fig. 12; other circumltances remaining as before. 1. If a fire be placed at C, that chimney will not fmoke, although the door and windows be perfectly clofe; becaufe a fupply of air mull come from the other chimney F, as was formerly mentioned, page 5. 2. If it were requifite to have a fire at F alfo, the fmoke in that chimney could not afcend at all, on ac- count of the current of air palling down it to fupply C. Or reverfely, if the fire were placed fill! at F, the chimney C would then fmoke for the fame reafon. To remove the defeat in this cafe without injuring the inhabitants, and to enable both chimneys to adt well at the fame time, it becomes necelfary to apply an air- dudt, as in the foregoing inllance, but in a different lituation. Its capacity mull alfo be enlarged, fince two chimneys are to be fupplied with air inftead of one. A dudt whofe fide is feven inches may anfwer the purpofe: its area will then be forty-nine inches, or nearly double to that of the former, whofe fide was efti- mated only at five inches. The moll proper lituation for it is at an equal dillance from each fire, as at E, becaufe a llream of air flowing up from thence will have the greatell pofljble effedt in ventilating the room. An air-dudl at any of the corners might indeed afford a fup-