Part 217

Dissolve and fill into hand grenades.

II.—Iron sulphate 4 parts Ammonium sulphate 16 parts Water 100 parts

Mix, dissolve, and fill into flasks.

III.—Sodium chloride 430 parts Alum 195 parts Glauber salts 50 parts Sodium carbonate, impure 35 parts Water glass 266 parts Water 233 parts

Mix, etc.

IV.—Sodium chloride 90 parts Ammonium chloride 45 parts Water 300 parts

Mix, dissolve, and put into quart flasks of very thin glass, which are to be kept conveniently disposed in the dwelling rooms, etc., of all public institutions.

V.—Make 6 solutions as follows:

a.—Ammonium chloride 20 parts Water 2,000 parts

b.—Alum, calcined and powdered 35 parts Water 1,000 parts

c.—Ammonium sulphate, powdered 30 parts Water 500 parts

d.—Sodium chloride 20 parts Water 4,000 parts

e.—Sodium carbonate 35 parts Water 500 parts

f.—Liquid water glass 450 parts

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Mix the solutions in the order named and to the mixture, while still yellow and turbid, add 2,000 parts of water, and let stand. When the precipitate has subsided fill off the clear liquid into thin glass (preferably blue, to deter decomposition) containers each of 3 pints to a half gallon capacity.

VI.—Calcium chloride 30 parts Magnesium chloride 10 parts Water 60 parts

VII.—Sodium chloride 20 parts Ammonium chloride 9 parts Water 71 parts

VIII.—Sodium carbonate 16 parts Sodium chloride 64 parts Water 920 parts

The most effective of all extinguishers is ammonia water. It is almost instantaneous in its effect, and a small quantity only is required to extinguish any fire. Next in value is carbonic acid gas. This may be thrown from siphons or soda-water tanks. The vessel containing it should be thrown into the fire in such a way as to insure its breaking.

«Dry Powder Fire Extinguishers.»—The efficacy of these is doubted by good authorities. They should be tested before adoption.

I.—Alum 24 parts Ammonium sulphate 52 parts Ferrous sulphate 4 parts

II.—Sodium chloride 8 parts Sodium bicarbonate 6 parts Sodium sulphate 2 parts Calcium chloride 2 parts Sodium silicate 2 parts

III.—Sodium chloride 6 parts Ammonium chloride 6 parts Sodium bicarbonate 8 parts

IV.—Ammonium chloride 10 parts Sodium sulphate 6 parts Sodium bicarbonate 4 parts

«Oil Extinguisher.»—To extinguish oils which have taken fire, a fine-meshed wire net of the size of a boiling pan should be kept on hand in every varnish factory, etc. In the same moment when the netting is laid upon the burning surface, the flame is extinguished because it is a glowing mass of gas, which the iron wire quickly cools off so that it cannot glow any more. The use of water is excluded, and that of earth and sand undesirable, because both dirty the oil.

«Substitute for Fire Grenades.»—A common quart bottle filled with a saturated solution of common salt makes a cheap and efficient substitute for the ordinary hand grenade. The salt forms a coating on all that the water touches and makes it nearly incombustible.

«Fireproofing»