Bauhaus-Universität Weimar

Titel:
The Book of the Lantern. Being a Practical Guide to the Working of the Optical (or Magic) Lantern. With Full and Precise Directions for Making and Coloring Lantern Pictures.
Person:
Hepworth, T. C.
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39440/93/
82 
THE BOOK OF THE LANTERN. 
pattern of very compact form is illustrated at fig. 34. In 
this case the by-passes are governed by taps which are 
adjusted by the operator with a screw-driver. This seems 
to be a good arrangement, as there is no chance of 
accidental turning off or on by a careless touch, as may 
happen when the by-pass taps are exposed. 
Fig. 34. 
There are one or two methods of manufacturing oxygen 
gas for the limelight as fast as it is used, and although, 
for reasons which I shall presently give, I cannot recom¬ 
mend such a procedure, the methods are ingenious enough 
to warrant notice. In Chadwick’s apparatus there is an 
iron gas-holder, which forms the support of the lantern. 
Associated with it is a special form of retort heated by a 
Bunsen burner, and charged with chlorate of potash and 
manganese made up into a cake previously. The operator 
starts with a full gas-holder, and at the end of perhaps 
fifteen minutes, when it is nearly empty, lights the Bun¬ 
sen burner, and in a few minutes enough gas is generated 
to fill it once more. The retort is now charged with a 
fresh cake of mixture ready for once more filling the gas¬ 
holder as it sinks.
        

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