Surgical instrument set, Indian, 19th century.

Three-ring Enigma cypher machine in wooden transit case, c 1930s.

Combined lever and rotary magic lantern slide, 19th century.

Model of a cylindroid, 1895-1900.

Model of a cylindroid, 1895-1900.

Cupping set, in wooden case, 1860-1930.

Inro, Japanese.

Inro, Japanese.

Drever and Collins performance tests, 1928.

Surgical instrument set, Indian, 19th century.

Optical toy employing multiplying lens, c 1880.

Three-ring Enigma cypher machine in wooden transit case, c 1930s.