Bauhaus-Universität Weimar

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.
Hepworth, T. C.
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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