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Knight's Mechanical Encyclopedia (ed. Knight) 1 1 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), N. (search)
, and gradually saturated with freshly precipitated hydrated protoxide of nickel. The heat is then removed, 2 1/4 liters of ammonia added, and water enough to make 25 liters, so that each liter of the bath contains about 50 grams of nickel. When cold, 500 grams carbonate of ammonia is added, the sediment allowed to settle, and filtered. The bath has a blue-black color, stands at 11° B., and is used at a temperature of about 50° C. Caustic potash or soda gives a thicker deposit. In Professor Stolba's process, a quantity of concentrated chloride of zinc solution is placed in a clean metallic vessel, and to this is added an equal volume of water. This is heated to boiling, and hydrochloric acid is added drop by drop until the precipitate which has formed on adding water has disappeared. A small quantity of zinc powder is now added, which produces a zinc coating on the metal as far as the liquid extends. Enough of the nickel salt (chloride or sulphate) is then added to color the l