English, c.1890, signed 'APPS, 433 Strand, LONDON, PATENT 683' blue velvet-covered secondary coil with vulcanite ends, lacquered brass terminals and breaker, spark gap on vulcatite insulators, all on a French polished mahogany base board, in original case with instructions to inside of lid, case 40cm, with a book on X-rays
Sold for £438
Result plus buyers premium
English, c.1890, signed 'APPS, 433 Strand, LONDON, PATENT 683' blue velvet-covered secondary coil with vulcanite ends, lacquered brass terminals and breaker, spark gap on vulcatite insulators, all on a French polished mahogany base board, in original case with instructions to inside of lid, case 40cm, with a book on X-rays
Auction: Fine Scientific and Medical Instruments, 12th May, 2022