Flexon spectacles, c 1990s.

Newtonian reflecting telescope, 1783-85.

Incense burner, Indian, 1801-1900.

Vickers indentation in nickel superalloy. L

Ceramic with molybdenum/nickel/gold coating

Basil Hall's ovariotomy clamp, 1910-1920.

Electron diffraction photographs, 1925.

Laryngeal forceps, early 20th century.

Coil spring spectacles, 1948-1960.

Basil Hall's ovariotomy clamp, 1910-1920.

Portable charcoal water filter, England, late 19th century.

Laryngeal instruments, early 20th century.