The gravity cell consisted of a glass jar, in which a copper cathode sat on the bottom and a zinc anode was suspended beneath the rim.
2.
A disadvantage of the gravity cell was that a current had to be continually drawn to keep the two solutions from mixing by diffusion, so it was unsuitable for intermittent use.
3.
This variant, called a gravity cell, consisted of a glass jar in which a copper cathode sat on the bottom and a zinc anode was suspended beneath the rim in the zinc sulfate layer.
4.
A later variant of the Daniell cell called the "'gravity cell "'or "'crowfoot cell "'was invented in the 1860s by a Frenchman named Callaud and became a popular choice for electrical telegraphy.
5.
He suggested either tethering passenger ships together to spin about a common center of mass or including self-rotating, dumbbell-shaped " gravity cells " to drift alongside the flotilla to provide each crew member with a few hours of artificial gravity each day.
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