. Inorganic chemistry . o constructed of stone-ware, and have the advantage of being cleanly and wood-cut (fig. 9) represents one, with a stoneware stand,A, for the jars, and a lateral aperture, B, for the beak of theretort or tube, C, delivering the gas. Atub, a wash-hand basin, a foot-pail, aleaden cistern or sink, or any other water-tight box, may be used as a pneumatictrough, with a couple of bricks or flatstones to support the jars. 247. Besides the pneumatic trough,with its glass jars, it is desirable to have o^jpvessels of larger capacity, in which con- **siderable quant
. Inorganic chemistry . o constructed of stone-ware, and have the advantage of being cleanly and wood-cut (fig. 9) represents one, with a stoneware stand,A, for the jars, and a lateral aperture, B, for the beak of theretort or tube, C, delivering the gas. Atub, a wash-hand basin, a foot-pail, aleaden cistern or sink, or any other water-tight box, may be used as a pneumatictrough, with a couple of bricks or flatstones to support the jars. 247. Besides the pneumatic trough,with its glass jars, it is desirable to have o^jpvessels of larger capacity, in which con- **siderable quantities of gas can be col-lected, and from which it can be drawnoff at pleasure. Such vessels are called •gas-holders, or gasometers, and are con-structed of tin plate, or, better, of zincor copper. The figure (fig. 10) repre-sents one of the most convenient, dis-tinguished by its inventors name, as ^2- i°-Pepys gas-holder. A is a metallic drum or cylinder; B alarge funnel, communicating with A by a small tube C, which. 8o Chemistry. terminates in the roof of the cylinder, and a large one, D, whichdescends to nearly the bottom; E is a pillar of support to thefunnel; F is a tube placed at an angle with the cylinder, and pro-vided with a nut which screws into its mouth, and fits it air-tight;G is a stop-cock, projecting laterally from the top of the In the figure the gas-holder is represented in the condi-tion in which it would ordinarily be called empty—^in other words,full of air. As a preliminary step to filling it with gas, water ispoured into the funnel B. It descends by the tube D, andpartly by C, whilst the air escapes by C and G. When waterruns out at G, the cylinder is full, and all the stop-cocks are nut of the obUque tube, F, is then unscrewed, and the beakof the retort, or exit tube of the flask, from which the gas isissuing, is inserted through F, and pusfied in till its end isfairly within the cylinder. The gas rising vertically, accumulates
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