£ IMPROVEMENTS IN GALVANISM. 



A communication may be made by a copper wire from the 



wet or corroded furface to the oppofite or dry furface, as 



Ihewn at A and C. 



Another of As it may be difficult to bend a very long piece of laminated 



many pieces aft- ^i^c and to keep it flat, fo as to give it a fecure and clofe 

 ing as one. r ' o 



fixture in the cement, I fliould prefer a number of lirait pieces 



fcrewed together with varnithed pieces of wood between their 



extremities : every fecond piece being perforated on the acid 



fide, to permit a free communication. 



More particular Mr. Wilkinfon's pile of diflies promifes to be very efFedual, 



account of the ^^^ ^f ^r conftruaion. I fuppofe the diQies to be of zinc, 



pile of dimes. -^ ' » ' 



either caft in a metallic mould or ftamped, and that each (hould 



be provided with three (hort copper legs, foft-foldered on ; 



after which, the lower face of the difli fliould be well defended 



by varnifh or cement, and alfo the lower ends, but not the 



iides of the copper legs. Thus prepared, they might be eafily 



builded up, and charged by a proper funnel, and an appropriate 



meafure for dealing out the acid. 



Galvanic trough In Fig. 2. I have ventured to offer the tketch of a trough, 



of one metal confifting" of zInc plates only, principally becaufe it appears 



convertible into , , f u • C Ji i j -.u j *u 



a fingle plate, by capable 01 bcmg as Ipeedily charged with acid as another 



varying the com- trough, and may with facility and at pleafure be ufed either as 



one fingle plate, or as the ufual feries of plates, ading in 



fucceffion upon each other. Let A B reprefent a trough con- 



flru6ted after the manner of Cruickfliank ; excepting that the 



plates are of zinc only : and let the alternate fliaded cells be 



charged with diluted acid, while the dotted cells continue 



empty. This may, without difficulty, be done at one pouring, 



by means of a channel in the wooden tide of the trough. 



Arrangement to Whether this trough, fo charged, fliall a&. as one extended 



produce the cralvanic furfacc, or as a continued feries, will be governed 



ufuai effeft of a f , ■ c ■ .■ re , r . 



large plate. by the copper Wires ot communication. If the former, then 



a long copper wire having branches defcending from it into 

 every one of the acid cells muft be duly placed ; and another 

 wire parallel to, but not in contact with, the former, and 

 having double branches defcending into all the empty cells, {o 

 as to touch both the dry metallic furfaces, muft alfo be placed. 

 Whenever a communication is made between thefe two 

 principal wires or condu6tors, the galvanic energy will pafs 

 through the medium of communication. I have not given a 

 diagram, becaufe this difpofition is very obvious. 



If 



