Ten Mathematical Equations 5

Date
1971
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Abstract

Two stamps from The Ten Mathematical Equations that Changed the Face of the Earth series. Issued by Nicaragua on May 15, 1971.

Description
"De Broglie's Law" 1cor. air stamp depicting "diffraction circles made by an electron microscope." "Archimedes' Law" 2cor. air stamp depicting "a pair of scales and a foundry scene of molten metal being poured from a ladle into a mould."
Keywords
Stamp collecting, Postage-stamp albums, Nicaragua, Broglie, Louis de, 1892-1987, Electron microscope, Archimedes, Archimedes' principle
Citation