The egg in the Amherst College Collection was made by E. Ducretet and Company of Paris.
Note that the electric egg in the middle below is made from uranium glass,
with is also present in the Gassiot's
Shower cup.
The left-hand example is by Apps of London, and is not a true electric
egg. A very similar piece is shown at a price of $6.00 in the 1856 catalogue
of Benjamin Pike, Jr. of New York, who may have imported the apparatus.
The electrodes are made of carbon, and adjusted until they almost touch.
After the globe is filled with chlorine gas, an electric arc is struck
between the electrodes, which glow red hot. The chlorine is unaffected
by the heating of the electrodes.
The upper electric egg is at Bates College
in Maine, and was made by Chamberlain of Boston. This firm became Chamberlain
and Ritchie by 1854, which sets an upper bound to its age.
The lower example is from St. Mary's College in Notre Dame,
Indiana.
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