English, c.1890, plaque for 'APPS, 433 Strand, London,. Patent 863' the coil on a large French polished mahogany plinth base, with spark gap insulators to the front, polarity switch and breaker to the right, long primary coil with secondary coil both in vulcanite, all in the original case with instructions to inside of lid, case 48cm wide.

Footnote: This lot contains ivory and has been registered in accordance with the Ivory Act (Section 10), Ref.NA3VR85Z Flints Auctions CANNOT ship this item out if the UK.