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.
adopted on a commercial scale, depends upon the action of 
cobalt on bleaching powder (Calcic hypochlorite). The 
lime must be in the form of a concentrated solution, and 
this is best brought about by mixing, say, one pound of 
bleaching powder, which is commonly called chloride of 
lime, with a quart of water. Stir this mixture and allow 
it to remain for an hour. Now decant the clear liquid, 
and pour it upon a fresh pound of lime—stir as before, 
and strain the product through a calico or flannel bag. 
Place the liquid in a large bottle, to the cork of which 
a tube is fitted. Now drop into the liquid, taking the 
cork out for the time being, a small quantity (say 2 ounces) 
of a strong solution of cobaltic peroxide, when oxygen gas 
will be quickly evolved, and will come off through the 
replaced tube. The evolution of gas is increased by 
warmth. The same cobalt can be used again and again, as 
it does not undergo any permanent change. It seems to 
act merely as a conveyer of oxygen, taking it from the 
lime, passing it to a higher state of oxidation, and then 
giving it up again ; any solution of cobalt will answer the 
purpose. When the gas ceases to come, the residue in the 
bottle should be diluted with water, and, after having been 
allowed to rest for some time, the cobalt will settle at the 
bottom of the vessel. This can then be washed, kept in a 
moist state, and used over again as often as required. 
But the more general method of preparing the gas is by 
means of the decomposition of potassic chlorate, and 
that method I shall now, therefore, describe in detail. 
The lime-light has, in certain quarters, earned the cha¬ 
racter of being dangerous, not so much from accidents


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