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" ... any free acid. The crystals should be dissolved with the aid of gentle heat, but the temperature to which the solution is raised should not exceed 30° C. "
Guide to the Practical Elements of Electrical Testing - Page 39
by J. Warren - 1901 - 186 pages
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The Law Relating to Electric Lighting, Traction and Power

John Shiress Will - Electric engineering - 1903 - 511 pages
...twice its weight of crystals of pure zinc sulphate, and adding zinc oxide in the proportion of about 2 per cent, by weight of the zinc sulphate crystals to neutralise any free acid. The crystals should be dissolved with the aid of gentle heat, but the temperature to which the...
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Laboratory Exercises in Physical Chemistry

Frederick Hutton Getman - Chemistry, Physical and theoretical - 1904 - 241 pages
...slightly, but the solution must not be warmed above 30° C. Mercurous sulphate purified as in (c) is added in the proportion of about 12 per cent. by weight of the zinc sulphate crystals to neutralize the free zinc oxide remaining. The solution is then filtered and cooled to 0°. Crystals...
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Electric Lighting: A Practical Exposition of the Art, for the Use ..., Volume 1

Francis Bacon Crocker - Electric lighting - 1904
...is raised must not exceed 30° C. Mercurous sulphate, treated as described in 3, shall be added it» the proportion of about 12 per cent by weight of the zinc sulphate crystals, to neutralize the free zinc oxide remaining, and then the solution filtered, while still warm, into a...
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The Statutory Rules and Orders Revised: Being the Statutory Rules and Orders ...

Great Britain - Administrative law - 1904
...twice its weight of crystals of pure zinc sulphate, and adding zinc oxide in the proportion of about 2 per cent, by weight of the zinc sulphate crystals to neutralise any free acid. The crystals should be dissolved with the aid of gentle 'heat, but the temperature to which the...
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Bulletin of the Bureau of Standards, Volume 1

United States. National Bureau of Standards - Physics - 1905
...the solution is raised should not exceed 30° C. Mercurous sulphate treated as hereinafter described should be added in the proportion of about 12 per cent by weight of the zinc sulphate crystals and the solution filtered, while still warm, into a stock bottle. Crystals should form as it cools....
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Laboratory Work in Electrical Engineering (preliminary Grade): A Series of ...

John Roberts (Electrical engineer.) - Electric engineering - 1906 - 218 pages
...the aid of gentle heat, but the temperature to which the solution is raised should not exceed 30° C. Mercurous sulphate treated as described in 3 should...per cent, by weight of the zinc sulphate crystals to neutralize any free oxide remaining, and the solution filtered, while still warm, into a stock bottle....
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Telegraphy: A Detailed Exposition of the Telegraph System of the British ...

Thomas Ernest Herbert - Telegraph - 1906 - 912 pages
...the aid of gentle heat, but the temperature to which the solution is raised should not exceed 30° 0. Mercurous sulphate treated as described in 3 should...per cent, by weight of the zinc sulphate crystals to neutralize any free zinc oxide rcmaining, and the solution filtered, while still warm, into a stock...
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Telegraphy: A Detailed Exposition of the Telegraph System of the British ...

Thomas Ernest Herbert - Telegraph - 1906 - 912 pages
...gentle heat, but the temperature to which the solution is raised should not exceed 30° C. Mereurous sulphate treated as described in 3 should be added...per cent, by weight of the zinc sulphate crystals to neutralize any free zinc oxide remaining, and the solution filtered, while still warm, into a stock...
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Outlines of the Evolution of Weights and Measures and the Metric System

William Hallock, Herbert Treadwell Wade - Metric system - 1906 - 304 pages
...the solution is raised must not exceed 30° C. Mercurous sulphate, treated as described in 3, shall be added in the proportion of about 12 per cent, by weight of the zinc sulphate crystals to neutralize the free zinc oxide remaining; and then the solution filtered, while still warm, into a...
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A Handbook of Electrical Testing

Harry Robert Kempe - Electric measurements - 1908 - 706 pages
...which the solution is raised should not exceed 30C C. Mercuruus sulphate treated as described in (;() should be added in the proportion of about 12 per...and the solution filtered, while still warm, into a slock bottle. Crystals should form as it cools. (5) The MercuTout Sulphate and Zinc Sulphatu Puele....
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