Louis Dominique Joseph Armand Dunoyer de Segonzac (14 November 1880 – 27 August 1963) was a French physicist. He was awarded the Valz Prize by the French Academy of Sciences in 1929 for research on

spirit level A spirit level, bubble level, or simply a level, is an instrument designed to indicate whether a surface is horizontal (level) or vertical ( plumb). Different types of spirit levels may be used by carpenters, stonemasons, bricklayers, ...

s and on photoelectric cells as applied to

astronomy Astronomy () is a natural science that studies celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and evolution. Objects of interest include planets, moons, stars, nebulae, g ...

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1880 births 1963 deaths École Normale Supérieure alumni Knights of the Legion of Honour French physicists Optical physicists {{France-physicist-stub