VOL.6. No. 6
A SIMPLIPIED GASG E N E ~ T O R
1147
A SIMPLIRIED GAS GENERATOR GREGG M. EVANS, YANKTON COLLEGE. YANKTON, SOUTH DAKOTA While no particular originality is claimed for the gas generator shown herewith, it is believed that it has been reduced about to the utmost in simplicity of requirements for its assembly. Only apparatus to be found in any laboratory is necessary. The container A holds the solid reagent. For this a wide-mouthed bottle or jar is desirable in order that as much as possible of the labor of breaking up large lumps of hard materials such as ferrous sulfide may be avoided. For a generator in use in this laboratory a five pound sodium hydroxide bottle was used for A, and for B and C, which serve as gas and liquid reagent reservoirs, the ordinary Z1/2liter acid bottles. Either pinch or screw clamps may be used a t E, F, and G. For C the bottom of the bottle is cut off with a hot wire cutter1 or if one is not available a file scratch around the bottle and application of a red hot glass rod is usually successful. Stoppers should be wired in and may be made gas tight with stopcock grease or paraffin. Rubber connecting tubes should be wired on. If the tube F be made in one , piece and extend an inch or so into B, and paraffin be melted into C, even concentrated sulfuric acid may be used as the liquid reagent. Stopcocks may be substituted for one or more of the pinch cocks, and a simple spray nozzle may be blown on the delivery end of F, but these are not essential. To use, put the solid reagent into A, and with E and F open, pour the liquid into C until it runs into A . Thereafter, with F left open, action is automatic as gas is used from E. To remove used liquid, close F and allow the gas pressure to force it out through G. The bottles, if not too large, may be supported by ordinary rings and clamps and assembled on a single ring stand. This type of generator is very economical, since the reserve liquid in B and C is not diluted, and the use of the bottle B as a gas reservoir allows the complete utilization of reagents during idle periods without loss of gas by bubbling back through the acid container. The size of the apparatus can be varied widely to conform to requirements, and since the cost is low, as many as needed may be made availahle. 5, 1289 (Oct., 1928). 'See, for example, Baker and Haldeman, THISJOURNAL,
