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Use of a small cooling tower for transformer circulating water
640
CURRENT TOPICS.
[J.F. I.
Nickel-plating Aluminum. ANON. (La Chronique IndustrielIe, 38th year, No. 224, September I, I915.)--A process of nickel-plating aluminum, invented by M. J. Carnac, which is claimed to produce a firmly-adhering coating, is described in Ind. e Inv., Barcelona. The aluminum is first cleaned in a bath of boiling potash; it is next brushed with milk of lime and then immersed into a bath of potassium cyanide for several minutes; finally it is subjected to the action of a bath of ferrous chloride, composed of 500 grammes of hydrochloric acid, 500 grammes of water, and I gramme of iron. After each operation the object is washed in clear water. Good results are obtained from a plating bath composed of water, iooo c.c. ; chloride of nickel, 50 grains ; boric acid, 20 grains ; with a current of I amp&re per square decimetre at 2. 5 volts. The good results of the process appear to depend upon the perfect cleaning and a suitable deposition on the aluminum of a thin coating of iron from the iron bath. The existence of this thin coating is verified by comparing with a magnetic balance a treated and an untreated specimen of aluminum. Under these conditions the nickel deposit infiltrates through the surface of the aluminum and adheres so thoroughly to it that, however heavy the deposit, it is impossible to detach the nickel without removing particles of aluminum. Use of a Small Cooling Tower for Transformer Circulating Water. ANON. (ElectricalWorld, vol. 66, No. 15, October 9, i915.)--The very considerable total loss of energy which takes place even in such high-efficiency apparatus as electric transformers may be well appreciated from the arrangement of the water-cooling service for the transformer at a new sub-station of the East St. Louis Light and Power Company. The practice at this station is that of cooling and recirculating the transformer cooling water in a minlature cooling tower. Water is pumped through two large transformers at the rate of about ioo gallons per minute by a 5-horsepower motor. The fact that water purchased from the city is used for cooling the transformers made the installation of the cooling system profitable.
PRESS OF ~. B. L I P p I N C O T T C O M P A N Y PHILADELPHIA
CURRENT TOPICS.
[J.F. I.
Nickel-plating Aluminum. ANON. (La Chronique IndustrielIe, 38th year, No. 224, September I, I915.)--A process of nickel-plating aluminum, invented by M. J. Carnac, which is claimed to produce a firmly-adhering coating, is described in Ind. e Inv., Barcelona. The aluminum is first cleaned in a bath of boiling potash; it is next brushed with milk of lime and then immersed into a bath of potassium cyanide for several minutes; finally it is subjected to the action of a bath of ferrous chloride, composed of 500 grammes of hydrochloric acid, 500 grammes of water, and I gramme of iron. After each operation the object is washed in clear water. Good results are obtained from a plating bath composed of water, iooo c.c. ; chloride of nickel, 50 grains ; boric acid, 20 grains ; with a current of I amp&re per square decimetre at 2. 5 volts. The good results of the process appear to depend upon the perfect cleaning and a suitable deposition on the aluminum of a thin coating of iron from the iron bath. The existence of this thin coating is verified by comparing with a magnetic balance a treated and an untreated specimen of aluminum. Under these conditions the nickel deposit infiltrates through the surface of the aluminum and adheres so thoroughly to it that, however heavy the deposit, it is impossible to detach the nickel without removing particles of aluminum. Use of a Small Cooling Tower for Transformer Circulating Water. ANON. (ElectricalWorld, vol. 66, No. 15, October 9, i915.)--The very considerable total loss of energy which takes place even in such high-efficiency apparatus as electric transformers may be well appreciated from the arrangement of the water-cooling service for the transformer at a new sub-station of the East St. Louis Light and Power Company. The practice at this station is that of cooling and recirculating the transformer cooling water in a minlature cooling tower. Water is pumped through two large transformers at the rate of about ioo gallons per minute by a 5-horsepower motor. The fact that water purchased from the city is used for cooling the transformers made the installation of the cooling system profitable.
PRESS OF ~. B. L I P p I N C O T T C O M P A N Y PHILADELPHIA