Christian Gottfried Ehrenberg, German naturalist, mid-late 19th century.

A scientist determining the distribution of proteins within a cell.

Two 'Friend' binocular vision test sets.

Cuff-type microscope, early 18th century.

A microscope, 19th century.

William Hyde Wollaston, English scientist, 1824.

Alexander Fleming, Scottish bacteriologist, 18 December 1943.

Jansen's microscope, c 1876.

Janssen's microscope, c 1867.

Musschenbroek hand microscope, Dutch, late 17th century.

Army isue folding binoculars, c 1895.

Army isue folding binoculars, c 1895.