 | Harold H. Simmons - Electric engineering - 1908 - 1012 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... | |
 | Carl Hering - 1910 - 810 pages
...solution is raised should not exceed 30 deer. C. Mercnrous sulphate treated as describe! in paragraph 4 should be added in the proportion of about 1'2 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.... | |
 | Horatio Alvah Foster - Electrical engineering - 1913 - 1676 pages
...the solution is raised must not exceed 30° C. Mercurous sulphate, treated as described in 3, shall neutralize the free zinc oxide remaining, and then the solution filtered, while still warm, into a... | |
 | British Association for the Advancement of Science. Meeting - Science - 1894 - 1096 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... | |
 | Great Britain - Delegated legislation - 1904 - 516 pages
...gentle heat, but the temperature to which the solution is raised should not exceed 30° C. Merounous sulphate treated as described in 3 should be added in the proportion of about 12 pei- cent, by weight of the zinc sulphate crystals to neutralise any free zinc oxide remaining, and... | |
 | National Academy of Sciences (U.S.) - Academies and institutes - 1883 - 798 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... | |
 | United States. Bureau of Standards - Physics - 1904 - 514 pages
...the solution is raised should not exceed 30° Ii. 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.... | |
 | Electric engineering - 1893 - 824 pages
...twice ita 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. (See notes below.) The crystals should be dissolved with the aid of gentle beat, but the temperature... | |
| |
... 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. 
