Details
A 19th-Century medical coil,
the iron core with leather cover and walnut ends, on mahogany plinth base -- 9in. (22.9cm.) wide; a galvanometer by H. Tinsley & Co.; a lantern lens; and an unusual bull's-eye lens in brass mount with iris diaphragm and pillar mounting, signed W. Watson & Sons, 313 High Holborn, London, the lens -- 4½in. (11.2cm.) dia. (4)
the iron core with leather cover and walnut ends, on mahogany plinth base -- 9in. (22.9cm.) wide; a galvanometer by H. Tinsley & Co.; a lantern lens; and an unusual bull's-eye lens in brass mount with iris diaphragm and pillar mounting, signed W. Watson & Sons, 313 High Holborn, London, the lens -- 4½in. (11.2cm.) dia. (4)