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KF5JRV > TECH 04.10.16 12:21l 24 Lines 1120 Bytes #999 (0) @ WW
BID : 2996_KF5JRV
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Subj: Electric current
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Sent: 161004/1115Z 2996@KF5JRV.#NWAR.AR.USA.NA BPQ6.0.13
1780 - Electric Current
Because of an accident the 18th-century Italian scientist Luigi
Galvani started a chain of events that culminated in the development
of the concept of voltage and the invention of the battery. In 1780
one of Galvani's assistants noticed that a dissected frog leg
twitched when he touched its nerve with a scalpel. Another assistant
thought that he had seen a spark from a nearby charged electric
generator at the same time. Galvani reasoned that the electricity
was the cause of the muscle contractions. He mistakenly thought,
however, that the effect was due to the transfer of a special fluid,
or "animal electricity," rather than to conventional electricity.
Experiments such as this, in which the legs of a frog or bird were
stimulated by contact with different types of metals, led Luigi
Galvani in 1791 to propose his theory that animal tissues generate
electricity. In experimenting with what he called atmospheric
electricity, Galvani found that a frog muscle would twitch when
hung by a brass hook on an iron lattice.
73 Scott kf5jrv
KF5JRV @ KF5JRV.#NWAR.AR.USA.NA
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