Foods.

  • Smith, Edward (1818?-74)
Date:
1873
Catalogue details

Licence: Public Domain Mark

Credit: Foods. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

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    effected by allowing cold air to enter by an opening through the wall, and then to direct it over heated pipes, the distribution is less satisfactory; but such pipes should be heated with water, and not with steam of an uncertain temperature, 9. Stoves which are placed in the middle of a room should be fed with wood and enclosed in an outer skin of metal or pottery. With coal and a furious fire, the air is not only dried to an injmious extent but burnt. 10. It is more than doubtful whether in our climate, or in any moist climate, the ordinary open fire-grate can be supplanted with advantage. It is otherwise in countries where the air is very cold and dry. Much dogmatic teaching has been given to the piiblic within a few years as to the quantity of air which must be supplied to a man in order to maintain uniformity of composition of the atmosphere, and it has been affirmed with an air of authority that 3,000 cubic feet is the proper supply per hour: that is to say, air enough to fill three rooms ten feet square and ten feet high must be given per hour: but Angus Smith, by a series of experiments and calculations, has found the fol- lowing to be a true estimate of a man's requirements. The second column shows the quantity of fresh air to be supplied to a man per hour to prevent the propor- tion of carbonic acid exceeding that mentioned in the first column— No. 154. Carbonic Acid Cu. ft. of air ro- per cent. quired per hour 02 2-000 03 1-333 04 1-000 05 800 06 G66 07 671 CnrI)onlc Acid Cu. ft. of uir ro- per cent. quired per liouc -08 600 ■09 444 -10 400 •20 200 •30 133 •40 100 Hence, if we take the standard composition of the