EDN

The frog galvanoscope — an early voltmeter consisting of a skinned frog’s leg with electrical connections to its nerve

The sketch above is the frog galvanoscope, a super-sensitive electrical instrument used in the late 18th and early 19th centuries to detect voltage. The instrument was invented by Luigi Galvani. In ...
insider.si.edu

Plate showing effects of "animal electricty" with frogs' legs from De Viribus Electricitatis in Motu Musculari.

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Electronic Design

Frog Legs Probably Won’t Charge Your Phone—the Discovery of Voltage

I don’t have any frog legs on my testbench. But that’s because I don’t live in the late 1700s (which is probably a bit obvious since you are reading this online). Back in the day, though, in place of ...
MIT Technology Review

First Laser Measurements of Magnetic Fields of Single Nerves

Biologists have known that nerves produce and respond to electrical signals since the 18th century, when Luigi Galvani discovered that the muscles in a frog’s leg twitch when stimulated by a spark.