'Valuable flame spectra', early 20th century.

Colour spectra of calcium, barium and strontium

HP42 G-AAUD 'Hanno' flying over the pyramids on the Cairo sector, 1930s.

HP42 G-AAUD 'Hanno' flying over the pyramids on the Cairo sector, 1930s.

Plate II, ‘Radiation and Absorption Spectra, 1878.

"Single sand glass in four pillared wooden mount, 18th century."

13th -13th century glass beaker.

Single sand glass in four pillared wooden mount, 18th century.

Imperial Airways travel poster, 1924.

Four Rorschach inkblot tests, 1921.

Auto-Union car, Germany, 1930s.

Sand glasses, 18th century.