The 1 1/8" diameter medallian is marked "Boyd's Battery", and on the reverse, "Jan 17,
1878, IMP 1879, LON ENG". The battery is composed of 12 peripheral disks of copper,
brass, and white metal, surrounding a central copper rosette. Boyd's 1878 patent date
makes it one of the earliest such quack medical devices, predating Richardson's battery by
two years. The battery was worn around the neck, preferably over the heart.
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