By \V~LLt,X~ ll. Wan~.
[A paper read bel~w~+ the ~'he,nieal S, eetion of the Fr~mklin Institute, NOV. 6, 1883.] il)mcltliled f|.Olll ptLge ]l~|.)
The results .i; exten&:d practical tri'fls of Mr. Weston's formula, made hv Ih. wriwr, hav(~ ..nvinced him of the substantial correetng~s of tlw,:laims ,}t' this inventor. Where the double sulptmte of nickel and amm,mimn is is us(,l th, addition of boric acid in the proportion -f ff,,m I t,, :~ .um'es It, the gallon of solution gives a hath less difficuh l-mai.tain in g(~ul working or(ler, and afl'ords a stronglyadhesive deposit ,,f ,M(d. Thv deposited metal is dense and white, approad> in I,rilllam.v lh'g obtahmd from the solution of the dout)le cyanide.
In 1,~s(l..I. Powell,*: of (2ineinnati, patented an electro-depositing solution " ,.,ml>SVd of the pyrophosphate of soda phosphate of nickel, the lfisull,hile ,)f' :~,da, aud citrate of nickel and ammonia. ')
In tim same year C. G. Pendelton,J-of .New York, patented the use of an add s.luti(m of the acetate of nickel. The inventor emphasiz, s the t:mtlon that this solution must always be kept acid. The metallic strength (,f this soluti(m is fhlly maintained by the solution of the ant,des, and tile t)ath ('onscquently requires no additions of fi'esh salt.
An inter~.stlng suggestion is that patented in 1880 by Mr. Powell,~. and which covers the use of benzoic acid in nickel-plating solutions.
In des(-rihing I,is iml)rovement Mr. Powell calls atteution to the fact (?) that simple salts ()t" nickel cannot be used ou account of their fhihm~ tu vivhl a regular depositΒ° He claims to have discovered that the addition of 1)enzoic add to any of the nickel salts, arrests in a marked degree the tendeney to an imperfect deposit~ and prevents the deeoml)ositi,m of the solution and consequently the formation of sub-sal~. The amount of benzoic acid necessary to be added m the bafll for lifts lmrpose is said to be ~ ounce to the gallon of solution. He, therefi,r(:, elarims " an electro-depositing solution consisting of a soluble salt of nickel, its solvent, and 1)enzoie acid." This bath is reported to give very satisf.u.to O, results,
In the same year Mr. ,1. H. Potts,tl of Philadelphia, was grantd a