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Illustrative photogaphic print and diagram, showing the compound photo-electric effect in argon
Stone slab with seven holes for cosmetic ointments, Egypt, 1991-1786 BCE
Classical & Medieval Medicine
Photogaphic print and diagram, showing a different classes of beta-ray tracks ejected from air by hard X-rays
Photogaphic print and diagram showing the compound photo-electric effect in krypton, produced by X-rays of 60 kV
Square pavement brick from Babylonia (Southern Iraq), 2nd millennium BC.
Stamps, cards and covers illustrating international air post, 1870-1950