Dr. Hare on the Theories of Electrical Phenomena. 49 
is enormous. It has been generally considered, that. asa. pro- 
tection against lightning. the same weight of metal employed as 
a pipe, would be more efficacious than in the usual solid form of 
a lightning rod: yet. this law does not hold good with respect to 
galvanic discharges, which are not expedited by a mere extension 
of conducting surface. Independently of the augmentation of 
conducting power, consequent to radiation and contact with the 
air, the cooling influence of which, according to Davy, promotes 
galvano-electric conduction, a metallic ribbon does not convey a 
galvanic discharge better than a wire of similar moth and aia aet ¥ 
eee Agteeably to the considerations above sta 
ea of a conductor remaining the same, in Fane 
danoat accumulation which it may discharge i is greater, the p 8 may 
are less superficial ; and the ethereo-ponderable atoms are affected 
more analogously to those exposed to galvanic discharges. _ It is 
ini ee a8 that the eees of a Leyden jar imparts magnetic 
pola the one hand, the electro-ethereal mat- 
municate polarity to the electro-ether. Hence statical Pica 
when produced by galvanism, and magnetism, | when prog uced 
by statical electricity, are secondary effects. ai 
67. ere a. wire is of such dimensions, in saotien bs fae 
charge, as to be heated, ignited, or dispersed by statical come 
city, there seems to be a transitory concentration of the electric 
power, which transforms the nature of the reaction, and an in- 
ems wave of electro-ponderable iene. similar to those of 
; rough 
sitio of. of proving the 
al atest (note 39),. ods ows 
ordancy. “At ‘the : ona time it may 
‘tte ponte le and —- 
: 10.. BOT.C! 
pre! ig " 1071. 
