144 On galvanic combWat.ioijsv 



Sennet made ex- and double touch, to the plates of the doubter, followed by 

 Selhkity °by the P rod uction of eledricity, by him called adhefive electricity, 

 contact of metals which were publifhed in his Nov Experiments on Electricity in 

 before j\^D. 17go ^ pages 86 tQ 1Q2 . and ot h ers were ma fe fey Cavallo O 



before 1795. the electricity produced by the contact or ftroke of a piece * 

 metal, let fall out of the hand, for the moll part, upon an in- 

 flated metallic plate, which were publilhed in the third 

 volume of his Eledricity in 1795. I do not know the date of 

 Volta's experiments, but believe them to be much later than 



They fuppofed thofe of the lame kind by Bennet. This laft philofopher, as 



various electric wel i as Cavallo, appears to think that different bodies have 



capacities j ri 



but the hypo- different attractions or capacities for electricity ; but the 



thefis of a cur- fi n cr U i ar hypothefls of electromotion, or a perpetual current of 

 tent of eleftri- _ * . . : \ . f , , , r ^ r r ..„ 



city produced by electricity being produced, by the contact ot two different 



metallic contafts metals is, I apprehend, peculiar to Volta. 

 belongs to Volta. 



XIL 



An Account 'if a Method of Cohjtru&ing Simple and Compound. 

 Gakanic Combinations, vdthout the Life of Metallic Subfiancei, 

 by means of Charcoal and dijj'erent Fluids. By Mr. Da'vy, 



Charcoal he,- l.AF a piece of well burned charcoal be brought in contact 

 tween nitnc acid at one f j^ f ur f aees ^.{^ a portion of water, and at another 



and water affords , * • 



galvanic effedt. furface with a portion of nitric acid, a fimple galvanic com- 

 bination will be formed when the two fluids are connected 

 together. And the powers of it are demonftrated by its agen- 

 cy upon the limbs of frogs, and by its effects upon the organs 

 of fenfe. ) 



Series of fuch 2. A compound galvanic combination or a galvanic battery 

 combinations. m2i y De f orim >d from a number of feries compofed of the fame 

 fubftances ; but in this cafe the fluid elements of each feries, 

 not being immediately in contact, muft be connected xvith 

 fimilar elements in other ieries in an order of regular alterna- 

 v lion, fuch as water, charcoal, acid; water, charcoal, acid; 

 ^nd fo on. 

 Charcoal battery & The be ft mode that has yet occurred of conflructing 

 by a feries of galvanic batteries with charcoal, is by means of a number of 

 K charged w?th~ gl a "*es, which are made to contain, alternately, nitrous acid, 

 nitric acid and and water, and which are connected in pairs by means of moil* 

 inter, and al- tcned 



