Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
hile making applications of atmospheric electri-city to animal organisms, accidentally observed convulsive movementsin the body of a frog, which he had prepared for some experiment, andhung on a copper hook near an iron frame of the window. Byfurther observation and experiment, he found that the… … The instrument in the handconsists of two pieces of metal,zinc, Z, and copper, C, joinedtogether at the contact withthe handle. By simply placingthe zinc in contact with tlienerves, at N, no convulsion oc-curs, but as soon as the coppercomes in contact with the limbbelow, the leg is convulsed…
Physics · Astronomy
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