Rheostat consisting of 22 separate resistors, European, 1870-1910 Rheostat consisting of 22 separate resistors 1870-1910
Induction coil, metal, on wood base, by Medical Supply Association of London, 167-185 Gray's Inn Road, London, England, 1880-1910. Induction coil 1880-1910
Ducretet spark coil, wood and metal, with wooden retort stand by Rochfort of Paris, French, 1901-1930 Ducretet spark coil 1901-1930
Electrotherapeutic machine, part only, large ring with wood sections catering metal, European, 1880-1910 Electrotherapeutic machine 1880-1910
White china switch and fuse box attached to rectangular wooden frame, part of Dr. Riviere' s experimental apparatus, French, 1880-1920 White china switch and fuse box attached to rectangular wooden frame 1880-1920