Magnified cane, 1787.

Magnified parts of the Goose barnacle, 1787.

Magnified plant material, 1787.

Magnified bee, 1787.

Young woman on tiptoes holding aloft a beach ball, c 1940s.

Homeles people, Second World War, 1940.

Commuters in the cafe at St Pancras Station, c.1940.

A flea, micrograph, 18th century.

Silva Combi 2 map measurer, c 1989.

Handbill advertisement for a microscope, early 20th century.

Optical effect of a convex lens, c 1990s.

A letter approving John Clark's silver microscope, 18th century.