Outlines of the origin and progress of galvanism : with its application to medicine : in a letter to a friend / by William Meade.

Date:
1805
Catalogue details

Licence: Public Domain Mark

Credit: Outlines of the origin and progress of galvanism : with its application to medicine : in a letter to a friend / by William Meade. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    ..Fig- yvlRtptefcnits tlus nioy*a^le couductor feparate, A, thegropT^ svbich admits it to Aide on the brafs rod B i'ig. 6. and in order lo change it to citlier fide of tlie Pile fo as to include any ^ivcn number of plales, it move* with a liihge 13. I'iie points C -are fliaped fo as to paf» ealily between each plate or cup', fo as to take the fliock between the pin D Fig 6. and any number required. F'g. 8. Is the brafs couduAor which moves on the rod.F G Fig. j. jnd fei-V£s to cftabKih the commuaicatioii at S. between the two piles ■fcc. '■ ■ Figuns 9 10 II Rcprcfenf the zlric and copper plates \vhich are ufed in tlie formation of the ]?ilc, the confthiclioa of them i» exclufivcly the contrivance of Fitzgeiald, and in this invention the principal iherit of ids inf^rumcnt ctJnfifts. jKg. 9.. repEefctttb iifcii'cu'ar plate of Copper A turne>1 in a lathe an^' fcooped, fo as to reprefeut in fome meafure the cover of a pi 1 -box.— ■To the bottom of this cvip is foldered a plate of zinc, about the th'ck- iiefs of a penny pi^ce, but not fo large as the copper cup. Fig. 10. Reprefc-nts the fsme fort.of coppci- cup as at A'Fi^. yj^ut without a plate of 2;inc attaclied to ir. This is the firft cup ufed iii the formation of the Pile, and is farther rcprefeiited at D Fig. 6. When, therefore.it is wiilicd to fo. m the Pile, nothing more is necelfary than to f.Il this cup uith a dilute acid nearly fo the top,, and then to place on it the cup Fig. 9. with, the plate of zinc B. loldered to it: by thib mean^ the zinc and copper are b-'th ih contaift with the fluid, and the two cop- per plates are prevented from touching each other by fmall bits of \vhale-bone cemented to each plate; this fimple contrivance therefore, precludes the neccflity of uilng difks of wet cloth between the plates, and by eipofiug each metal to a fluid contained in feparate cells, it has all the advantages of CruickQiauk's trough, without deviating materidly from the conftrutElion of the Pile, \vhile at the fame time it enables us to feparate and clean them at pleafure. Thus, in forming a pile to any extent, noihing mure is ueceffiiry than to couStrutft any number of cups of :he form Fi^. 9. of any dimchfions and by filling each cell with' a fluid, and piling them as defcribed over each other, a very povNcrful battery may be formed cij able of continuing in adliou for feverTil hours. , Fij^. 11. Rcpren^nts'thc firft cup of the fecond Pile, as iliewn at G. Tig.'J. v,'hcn hlleJ with a finid, fucH anorher cup as is defcribed in Fig. 9. A is placed on it wltli its corrcfponding plate of zinc B foldered to it; ihuB, by r.dding in fucccfTmn a fuflicicut number of thcfc ci'ps, the fis,