ANOTHER HYDROGEN SULFIDE GENERATOR A small hydrogen sulfide generator, constructed from two 250-ml. gasleveling bulbs properly connected and mounted on an ordinary ring.stand, as indicated in the accompanying diagram, has the following characteristics which make it suitable for use in the general and analytical laboratories. 1. It is simple, and broken
parts are easily replaced. 2 . It is compact, portable, and easily cleaned. 3 . A gas-washing bottle may be clamped to the same stand and thus become a part of the unit. 4 . If the gas is used in the "bubbling t h r o u g h method, the action of the generator may be stopped quickly by lowerinp the reservoir bulb. 5 . If the gas is used by the "closed flask" method, the action of the generator becomes automatic, and a slight pressure can be maintained. 6. A generator of this type may be used for the production of other gases, for which a Kipp is ordinarily used. The amount of acid charged into a generator of this type should not be greater than half the capacity of the reservoir bulb.
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