Experiments and observations on a new apparatus, called, a machine for exhibiting perpetual electricity : in a letter to the Rev. Dr. Horsley / from William Henley. Read at the Royal society, May 16, 1776.

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Experiments and observations on a new apparatus, called, a machine for exhibiting perpetual electricity : in a letter to the Rev. Dr. Horsley / from William Henley. Read at the Royal society, May 16, 1776. Public Domain Mark. Source: Wellcome Collection.