A MIXTURE of nitrate of potash, powdered charcoal, sulphur, and strontium nitrate driven into a strong paper case about two inches long, well closed at the end and varnished so as to be quite waterproof,may be set on fire and will continue to burn under water until the whole is consumed, provided that the cartridge be burnt mouth downwards (Fig.). The best effect is produced when burnt in a deep glass jar.
Requirment:-
The combustible (red fire) is made by mixing by weight:
strontium nitrate 40 parts,
flower of sulphur 13 parts,
chlorate of potash 5 parts,
sulphuret of antl mony 4 parts.
Powder the ingredients separately, and then mix carefully on a sheet of paper with a paper knife. On no account must sulphur and chlorate of potash be rubbed together in a morta . being very liable to explode. The composition should not be kept for any length of time before using, as is liable to spontaneous combustion.
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