. Journal. efully determined. By means of the formula— v (760-4-5)xlO0x(273xt) 273x(B-t)the volume is calculated which lOOcc. of moist air,measured at , would occupy under the same cir-cumstances. The stop-cock is opened, and by raising or are made of caoutchouc having the dotted shading. Theautomatic action of this apparatus, at once an exhaustor pressure pump, is brought about by an arrangementof automatic valves in the suction-tube B, and in theexit-pipe for the water I). For valves the arrangementsFigs. 1, 3, 4, 5 and 0 are recommended for 4 represents a valve consisting
. Journal. efully determined. By means of the formula— v (760-4-5)xlO0x(273xt) 273x(B-t)the volume is calculated which lOOcc. of moist air,measured at , would occupy under the same cir-cumstances. The stop-cock is opened, and by raising or are made of caoutchouc having the dotted shading. Theautomatic action of this apparatus, at once an exhaustor pressure pump, is brought about by an arrangementof automatic valves in the suction-tube B, and in theexit-pipe for the water I). For valves the arrangementsFigs. 1, 3, 4, 5 and 0 are recommended for 4 represents a valve consisting of a massive metalbell, or one covered with indiarubber, which sits in acaoutchouc ring and perfectly fits it. The narrowedpart of the tube above the ball has a waved outline (seesection Fig. 4a) so that air communication is establishedat m, n and o. However, by affixing the air-cominuni-cation tubes (Fig. 5) this object is also attained. 158 THE JOURNAL OF THE SOCIETY OF CHEMICAL INDUSTRY. [ 1885,. ,1885.] THE JOURNAL OF THE SOCIETY OF CHEMICAL INDUSTRY. 759 The construction shown in Figs. 6 and 7 is based onthe use of clapper-valves lined with caoutchouc (seeThe apparatus can also be made to serve as agas holder. The small apparatus (Fig. S) can be recommended forexhaustion or pressure in the ease of chemical analyses,whilst the larger one (Fig. 2) does good service forincreasing the pressure of illuminating gas, and as anair pump, the use of water service-pipes not beingneeded.—S. 11. Analysis of Platinum Ores. Ber. 18,2536-2551. The author discusses in a long and interesting paper thevarious methods proposed for the quantitative estimation of platinum, its separation from the other platinummetals and the separation of the whole of these metalsfrom the base metals be, Cu, and Ni, occurring in theores. The method proposed by Clans—viz., the reduc-tion of the higher chlorides to subchlorides by boilingwith NaOH solution and precipitation with N11 .(
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
