Daylight. A. Limitation of the Speed of Automobiles. The Current supplement. EARTH. in conjunction on December. 31st. Various salts added in small quantities to the water used in mixing Portland cement appreciably acceler ate or retard the setting of the mixture. The setting is retarded by water containing 4 per cent or more of sodium chloride and by weak solutions of calcium chloride but the latter salt in concentration higher than 9 per cent acts as an accelerator. Aluminium chloride accelerates while iron chloride Tuost soluble sulphates and even plaster of Paris retard setting. Aluminium sulphate is an accelerator and in the compound alums its effect preponderates over that of the retarding alkaline sulphates and produces a slight acceleration. The alkaline carbonates accelerate in concentration exceeds 10 per cent. Borax boric acid centration retard the setting., scientific american, -1909-10-23
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