84 ELEMENTS, CHEMICAL.
case being contained in the porous ceIJs c, c, c ; and plates of copper and zinc, or anjother suitable metals, may be employed. , aVe
The second improvement consists in cleaning copper and zinc plates after they ‘ _been used in a battery, by the employment of a voltaic battery ; and also in am “ J cl -mating or coating with mercury the surfaces of zinc plates, by t*he same means to rethem suitable for being used in the construction of the voltaic apparatus. -, r j c ,
The third improvement consists in exciting electricity by a combination ot . ]
sulphuric, or muriatic acid, with any of the following substances; viz., impure amnionor lime liquor of the gas works, solutions of alkaline and earthy sulphurets, the at ^and their carbonates, or lastly the acidulous sulphate of iron generated fro®pyrites.
43
»tans
arararii tflistaJaiSEM
‘In el
!. v?. jgi§3
Another of Dr. Leeson’s manifold improvements is for depositing meta sen tedconsists in the employment of one battery, with the “ alternating cathode, r p ^ ea r-in fig. 44. It is composed of a beam, a, mounted on the shaft, b, which t ur t j er y b)ings carried by standards, c; the beam communicates with the anode of tn e ‘ „ ^jichthe wire, d, and a vibrating motion is given to it by the rod, e, from the slia ^ areis driven by an electro-magnetic engine, or any other suitable prime mover- ’ s0 fthotwo vessels containing mercury, connected by wires, h , h, with the cathode P^ irje tal s ;two metals composing the alloy (but if the alloy is to consist of more than j es arethen more vessels, ,g, will be required, for one each cathode plate); thes deposit.>immersed in a solution composed of similar salts of the different metals to a \vir e
together with the anode, or surface to be deposited upon, which is connec jj, e tv®
with the cathode of the battery. A communication is established ben r0 ds, i, *’
cathode plates, or supply metals, and the anode of the battery, by means 0 the 0l Jwhich are caused, by the vibration of the beam, a, to dip alternately into the article 1or the other of the vessels, g ; and thus each metal will be deposited o batt e1 ^
be coated, during the time that the connexion is established between it a t ; on s ofby the immersion of its rod into the vessel of mercury. The relative prop 6S ur ’two metals is adjusted by lengthening or shortening the rods, i. h as s 10 ' j s
so that they may be immersed for a longer or shorter period in the mere j t leaves AWhere the electrical current enters the electrolyte, is the anode; whethe cathode. in<renio ns ‘
The patentee describes ten other improvements, which seem to be = ^
Newton’s Journal, xxii. 292. ,-„ n nrv h» s
ELEMENTS, CHEMICAL. The catalogue given in the Diction a
augmented by four new bodies ; Lanlhaninm, Didyminm, from Cenu ,