Bauhaus-Universität Weimar

Optical Projection: A Treatise of the Use of the Lantern in Exhibition and Scientific Demonstration
Wright, Lewis
42. Purifying the Gas.—Oxygen thus prepare! from 
commercial chlorate is not fit to pass direct into the bag. 
It is hot, and must be cooled ; it will contain a great deal of 
free chlorine, and must be purified, else both bag and brass- 
work will be rapidly destroyed. And it is very seldom 
properly purified. Properly purified and dried, new jets and 
taps should be used half-a-dozen times without any sign of 
Fig. 48.—Arrangement of Purifier 
green corrosion being visible on the bright brass. I speak 
from experience. 
The hot gas is passed through at least one cooler and 
purifier, as shown in fig. 48, connecting the delivery-tube of 
the retort by a piece of vulcanised tubing with the pipe which 
goes nearly to the bottom of the purifier, and the tube which 
leaves the top of the purifier, with the gas-bag or the next 
purifier. Where only one purification is attempted, the whole 
arrangement is shown in fig. 48, the gas bubbling up through


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