>
>A "galavanometer" is an ammeter - usually a very sensitive one. The name 
>comes from Luigi Galvani who discovered in about 1780 that a dissected 
>frog's legs would twitch when a "cell" was formed by the metal scalpel and 
>dissection plate. His theory about why this happened, which he verified 
>with careful experiments,  was subsequently discredited but the basic 
>principle which he discovered forms the basis of a vast range of modern 
>applications. (They told me about him in school long ago but Google 
>provides http://www.newadvent.org/cathen/06371c.htm which gives lots of 
>interesting detail.

Galvanic isolation keeps the patient from emulating the frog!

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