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Much care is required in mixing and sieving batches containing lead and other poisonous ingredients, to prevent the inhalation of the dust by the mixer. Therefore, where such materials are used, exhaust fans and ventilating ducts should be provided and fitted in the mixing rooms. A proper respirator should be worn by the mixer in charge to prevent any absorption into his system of the poisonous dust. Cases of poisoning are not unknown, but these are due to gross carelessness. A small regular weekly dose of Epsom salts should be taken by the mixers who have to prepare lead batches. This salt tends to remove any lead salts absorbed in the system by converting them into insoluble lead sulphate.

CHEMICAL FORMULAE AND MOLECULAR WEIGHTS.

Materials. Formulae.Molecular Weight.Alumina23102Antimony Oxide23287Arsenic23197Bismuth Oxide23468Boric Acid3362Borax2472382Calcined Borax247202Calcined Potash23138CarbonC12Carbonate of Barium3197Carbonate of Magnesia384China Clay2232258Chrome Oxide23153Cobalt Oxide23105Copper Oxide (Red)2143Copper Oxide (Black)CuO79Cryolite26210Dolomite2184Fluorspar278Gold Chloride32339Iron Oxide23160LimeCaO56Lime Spar3100Manganese Oxide287Nickel Oxide275Nitrate of Soda385Phosphate of Lime342310Potash Carbonate232174Potash Felspar2232556Red Lead34683Saltpetre3101Sand260Soda Carbonate23106Sodium Fluoride361Sulphate of Soda24142Tin Oxide2150Uranium Oxide2272Zinc OxideZnO81