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Keywords: Opfindelsernes bog3 fig282.png Drawing of a pith ball electroscope invented 1754 by John Canton The ball is shown attracted to an electrically charged object held in the hand Opfindelsernes Bog 1878 af André Lütken Fig 282 ”283 Det elektriske Pendul Opfindelsernes Bog Book of inventions 1878 by André Lütken Ill 282 2007-06-27 Morten Bisgaard PD-Old PD-old Opfindelsernes Bog III Electroscopes |