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 |   Related post: times its volume at 15° C; and 760 mm., or 5.1816 times its volume at o** C. and 760 Buy Decadron Online mm. It yielded 6.201 times its volume of products of combustion at 15** C; and their percentage composition was: Car- bonic acid, 8.392; aqueous vapor, 21.597; nitrogen, 70.011. The volume of gas and air together was 6.466; and therefore the con- traction on combustion amounted to 0.265 or 4.1 per cent, of the original volume. The next table shows the percentage composi- tion of the products of combustion with different proportions of air — Volumes of Air in Terms of the Theo- retical Quantity Purchase Decadron Online Needed. 1 1.5 Carbonic acid . . 8.392 5825 Aqueous vapor..2 1.597 14993 Nitrogen 70.01 1 72,728 Oxygen — 6.452 The general equation for calculating the quantity of air from the proportion of carbonic acid in the products of combustion was deduced. If a =the percentage by volume of carbonic acid, and m = the multiple of the theoretical volume of air required, then — 4936 — 5-88i9a w = — + I 5.1816a The quantities of air for all the trials were deduced by aid of this equation. The value of m thus found permits of the volume of the exit gases at the temperature at which they leave the stove being readily deduced. With m times the theoretical quantity of air required for x volumes of gas burnt per hour, and with the exit 2 3 4 4.461 3038 2.304 11.480 7.829 5.928 74.170 75-685 76.460 9.880 13463 15-310 442 Trials of Oas SkA?e6, gases at t° C, and the barometer standing at b mm., the volume of exit gases per hour would be — 760 273 t "" (0739 + 54-66m) X . b 288 The volumes of exit gases for all the trials were deduced from this equation. The specific heats for a temperature of 100** C. are, according to Slaby: For carbonic acid, 0.216; for aqueous vapoi", 0.459; and for nitrogen, 0.247. These values, with the proportions by weight of the respective gases found in the exit gas from the combustion with the theoretical quantity of air, show a Buy Cheap Decadron loss of 5.55 calories in the exit gases from the combuston of i cubic foot of gas for a differ- ence of 100° C. between their temperature and the temperature of the room. But a cubic foot of gas develops 155.7 calories. The latent heat or heat of vaporization of water amounts, however, to al)out 17 calories, and hence the calorific value of a cubic foot of the gas, supposing the water formed by combustion remains as steam, is only 155.7 — 17.0 = 138.7. The loss of heat through the 5-55 X 100 exit gases is, therefore, equal to or 40 per cent, of the 1387 total available heat of the gas. With m times the quantity of air theoretically required for the combustion, the heat lost through the excess of air is 4.51 (m — i) calories per cubic foot of gas con- Generic Decadron sumed for a difference of temperature of 100® C; and the total quantity of heat lost per hour becomes = 5.55 + 4.51 (m — i) 4.51^/1 + 1.04, or for every degree difference between the tem- perature of the exit gases and that of the air of the room the loss Order Decadron Online of heat per cubic foot of gas burnt is equal to 0.045 iw + 0.0104 calories. By the aid of this factor, the loss of heat for any given consumption of gas, and any difference in the temperature of the air and exit Cheap Decadron gases, is readily calculated. The results of the more important trials are given in the fore- going table, which is compiled from the immense mass of figures given by Professor von Ihering. The examples have been selected with a view to giving a fair impression of the general efficiency of healing by gas; and they are not necessarily indicative of the rela- tive merits of the different makes of stoves. Experiments were made with Michel's stove on the influence of the size of the exit flue. Screens or dampers fitting the pipe closely, and each having Trials of Gas Stoves, 443 circular hole of known diameter, were inserted in turn at the base i the pipe. The greatest efficiency was found when the orifice was nly 0.79 inch in diameter. The heat lost in the exit gases was then nly from 3 to 5 per cent, of that developed; and this result ap- eared to be due to a reduction of the excess of air, brought about y the contraction of the flue. The efficiency increased with a dim- lution of the gas consumption. The Dessau and Siemens' stoves lowed similar results when the regulating flap in the exit pipe was artially shut so as to contract the outlet to about 0.79 inch. It appears that, by selecting an exit pipe of suitable diameter, iie efficiency of the stoves can be raised from 80 to 96 or 97 per ent. A low temperature of the exit gases is found with the Graf tove. This is in part due to a narrow outlet, and in part to a water ooler which enters Buy Decadron into its Order Decadron construction. The water began to boil 'ithin a quarter of an hour of the lighting of the stove and continued 1 a state of noisy ebullition, while the humidity of the atmosphere »ecame so great that water condensed on the walls, etc., and the rial had to be broken off. On comparing the transmission of heat by the Purchase Decadron walls with figures ►btained by the use of the generally recognized coefficients for the arious materials, it was found that nearly one and a half times the :alculated amount of heat was actually transmitted. 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