. Transactions. plating mixture is composed of either copper oxide orfinely divided copper, or a mixture of both, ground to the consistency of alight varnish in a crude oil having an asphaltic base, of a specific gravityof from 14° to 16° Be. The plating mixture which gives the best results * Professor of Metallurgy, Lehigh University. lU. S. Patents 1197693, 1197694, 1197695, Sept. 12, 1916, to William E Watkins. 366 AUTOMATIC COPPER PLATING consists of 4 lb. ( kg.) of copper oxide ground together with 4 lb. offinely precipitated copper, and made to the consistency of a Ught varnishby grin
. Transactions. plating mixture is composed of either copper oxide orfinely divided copper, or a mixture of both, ground to the consistency of alight varnish in a crude oil having an asphaltic base, of a specific gravityof from 14° to 16° Be. The plating mixture which gives the best results * Professor of Metallurgy, Lehigh University. lU. S. Patents 1197693, 1197694, 1197695, Sept. 12, 1916, to William E Watkins. 366 AUTOMATIC COPPER PLATING consists of 4 lb. ( kg.) of copper oxide ground together with 4 lb. offinely precipitated copper, and made to the consistency of a Ught varnishby grinding it in 1 gal. ( 1.) of Mexican crude oil of specific gravityof 14° to 16° Be. It is found that the asphaltic base of this oil has re-ducing power sufiicient to reduce the oxide of copper to metal, in thefurnace, and to protect the precipitated copper from oxidation duringthe operation; also to reduce any oxide of iron that may have been onthe sheet. One gallon of oil can reduce 5 lb. of copper Fig. 1.—Sheet-feeding machine and coating rolls. This mixture has also been found to have the proper viscosity for itsapplication to the sheet by coating or inking rolls, and to hold it uni-formly on the sheet when exposed to the furnace temperature so as toproduce a uniform deposition of strongl} adherent copper upon the number of variations of this mixture have been used, such as usingcopper oxide only, mixed with powdered charcoal, or using precipitatedcopper only without any copper compound. ]\Iexican crude oil is prob-ably the cheapest liquid to use, suitable for this purpose, but otherliquids of similar properties have been used with nearly equivalentresults. JOSEPH W. RICHARDS 367 Automatic Feeding axd Plating ^Machine As the boxes of sheets are placed on the platform of the machine, itis necessary to lift the sheets one by one and feed them, hke feeding paperto a printing press. This can be done b}^ hand but has been accomplishedvery satisfactorily by
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
