Here's a free on line book "Magnetism and Electricity", 1877
Chapter 6 Electroscopes and Electrometers starts on book page 74 (pdf pg 81)
but . .
Chapter 11 Voltaic, Dynamical or Current Electricity is where paragraph 214 Bohnenberger's Electroscope appears on book
pg 169 (pdf 176).
This is the chapter for the Voltaic Pile so that's probably why since it's a
way to testing polarity.
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