A manual of practical hygiene / by Edmund A. Parkes ; edited by F.S.B. Francois de Chaumont.

Date:
1878
Catalogue details

Licence: Public Domain Mark

Credit: A manual of practical hygiene / by Edmund A. Parkes ; edited by F.S.B. Francois de Chaumont. Source: Wellcome Collection.

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

    191/820 (page 145)
    cubic metres = 1059 cubic feet. Hospitals, = 80 cubic metres day and night- = 2825 cubic feet (in epidemics, 160 cubic metres).* Eanke, in bis work on Physiology,! fixes the quantity at 60 cubic metres (2118 cubic feet) as the necessary minimiim amount. Eoth and LexJ adopt the maximum of -6 per 1000; but as they estimate the expired C02 as 20 litres,§ or -706 cubic feet (Eng.) per hour, they give the hourly quantity of air as 100 cubic metres, or 3500 cubic feet. In mines which are thought to be well ventilated, not less than 1400 cubic j feet are given per head per hour, and if there is much fire-damp, as much as 6000 cubic feet have been supplied.|| A horse requires 2450 cubic feet per hour at the least. Marcker has lately given the following amount from experiments:—For big cattle of 1000 ft weight, 30-40 cubic metres ( = 1059-1412 cubic feet); for little cattle of the small weight, 40-50 cubic metres (=1412-1765 cubic feet). These amounts seem very smaU, but Marcker s reasons for not giving more seem to be on account of the lowering of the temperature. Although, in order to give precision to the subject, it is necessary to attempt to define the minimum quantity which is necessary, there is no doubt it is advantageous to have a larger amount. In the case of men in active work the amount of arr must must necessarily be larger than in repose Even assuming the erect instead of the recumbent position increases the amount of carbonic acid given off. As men in work appear to give off from 0-0060 to nf l t°U+ f if00* l^Pf a°f b0d^ WeiZU> a^ing to the hardness of the work it follows that, to keep the air to the adopted standard of puritv a man weighing 150 Bis ought to have from 4500 to 8600 cubic feet of fresh air per hour, according to the amount of work he does. In short wherever practicable, we should be contented with nothing less than an almost unlimited supply. 2. On the Quantity of Air required for Lights, if the Air is to be kept Pure by Dilution. Air must be also supplied for lights if the products of combustion are flowed to pass into the room Wolpert has calculated that, for every cubic foot of gas 1800 cubic feet of air must be introduced to properlv dilut the products of combustion; and this is not too much if we^remember^tw7 cubic foot of good coal gas produces about 2 cubic feet oi Sc acid td that sulphuric acid and other substances may be also iovmS A ' Cner will burn nearly 3 feet per hour, and' wmtntmflO ot cublc feet m an evenmg 4 hours , and therefore from 18 000 tn 9lTnn i feet of air must be introduced for this purpose alone fotWl 21'6°0cublc products of combustion are removed CT^ec^ T8'^9 th& of illumination being equal, gas does nomocZl f T'1 • The P°Wer candles (Odling), but usually so much Z^ b^^^T0 ^ ^ ^re deteriorated there is ^^^^^^^ ™* * These amounts are somewhat modified in his Mnt,„„i r> i. Ventilation, 1874. They are, however, all too low for ^ ™tT? du Cb!UlffaSe and de la ■ t Grundziige der Phys., 1868, p. 376. g00cl vent'lation. t Loc. cit. p. 221. § This amount is also adopted by Genera] Morin II It has been stated, from extensive observation's tw • the greatest energies of the men, no less than 10C ffi\ m,nes> ,f {t 18 wished to keep np hour) must be given; if the quantity is reduced tonnp i • , per man Per mi«tc ( = 6000 per diminution in the amount of work done 13^ ™t rV-01'CVen 0,,e-half- there '» a serious the air wanted in the mine for horses, lights kc p J s amo,lnl< includes, of course all PP. 298 and 308. ' g ' ^—Proceedings of the Civil Engineers, vol $