Chemistry and Physics. 15 
being filled with mercury and inverted in the proper vessel, the 
cylinder is placed over the whole and filled with water. This 
e 
levels of the mercury in the eudiometer and in the barometer 
i The diffe the 
are read off w a cathetometer. rence gives 
tension of the gas, and the former reading the volume of the 
as moistening the interior of the barometer bulb, the cor- 
no separate correction is needed for this. By means of the tube 
Opening beneath the mouth of the eudiometer, not only may gases 
be introduced but also liquids for absorption. An oxygen de- 
«> 1882, G 
n the Determination of Sulphur in Coal Gas.—An im- 
proved form of apparatus for the determination of sulphur in 
coal gas has been devised by Knustaucu. The gas is collected 
be filled either with gas or water 
drawn out, slightly bent at right angles, and ground in to the 
tubulure of this a tube passes connecting with a second absorp- 
tion bottle. Then comes a series of bulbs and finally a wash 
bottle connected with a meter and a Bunsen pump. _ By the side 
potassium carbonate, ten grains to the liter, contained in the ab- 
Sorption flasks, The amount of admixed air is determined from 
the combustion products passing through the meter. The co 
tents of the absorption bottles are treated with permanganate to 
oxidize any SO,, decolorized with oxalic acid, and precipitated 
With barium chloride; 10 ¢.c. of a solution containing 7 grams to 
hi The 101 uires about an hour and the results 
vary only 6-2 to 0°3 gram of sulphur in 10,000 liters of gas—~ 
Ber. Beri. Chem. Ges., xv, 2397, Nov., 1882. eh Sy 
