Optical path of a Hadland Hyspeed camera.

Diagrams of sections of the Compound Microscopes

Lighthouse optic from Eilean Glas lighthouse, 1907.

Lighthouse optic from Eilean Glas lighthouse, 1907.

Lighthouse optic from Eilean Glas lighthouse, 1907.

Marconiphone model 702 mirror-lid television receiver, c 1936.

Lighthouse optic, Science Museum, London, June 2000.

Drawings cabinet once owned by Charles Babbage, 19th century.

Drawings cabinet once owned by Charles Babbage, 19th century.

Soleil Scheibler polarimeter, 1887.

Small Gregorian telescope, c 1760.

Big Optics interactive, Science Museum, London, 1992.