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ceilometer
(Encyclopedia)ceilometer sēlŏmˈĭtər [key], in aviation and meteorology, automatic instrument used to record ceiling, i.e., the altitude of the lowest cloud layer covering more than half of the sky. The ceilome...Stamford, city, United States
(Encyclopedia)Stamford, city (1990 pop. 108,056), Fairfield co., SW Conn., on Long Island Sound; settled 1641, inc. 1893 as a city within the town of Stamford (the two were consolidated in 1949). A variety of light...Martin, Homer Dodge
(Encyclopedia)Martin, Homer Dodge, 1836–97, American landscape painter, b. Albany, N.Y. His earlier works are in the style of the Hudson River school, but after his stay in France (1881–86) his work showed the ...photoelectric cell
(Encyclopedia) CE5 Photoelectric cell: Light causes a photosensitive surface to emit electrons, which flow as current to the positive terminal. A galvanometer measures the current and thus indicates light intensi...optical activity
(Encyclopedia)optical activity, the ability of asymmetric compounds to rotate the orientation of planar polarized light. Such compounds and their mirror images are know as enantiomers, or optical isomers. Although ...Fresnel, Augustin Jean
(Encyclopedia)Fresnel, Augustin Jean ōgüstăNˈ zhäN frānĕlˈ [key] 1788–1827, French physicist and engineer. He is known for his research on light, especially on conditions governing interference phenomena ...diffraction
(Encyclopedia)diffraction, bending of waves around the edge of an obstacle. When light strikes an opaque body, for instance, a shadow forms on the side of the body that is shielded from the light source. Ordinarily...interference
(Encyclopedia) CE5 Constructive interference: Two crests or two troughs meet and combine (A, B, C). Destructive interference: A crest and a trough meet and cancel each other (D, E, F). interference, in physics, ...Sabatier, Auguste
(Encyclopedia)Sabatier, Auguste ôgo͞ostˈ säbätyāˈ [key], 1839–1901, French Protestant theologian. He was professor (1867–72) of reformed dogmatics at Strasbourg, and from 1877 until his death he was a me...photochemistry
(Encyclopedia)photochemistry, study of chemical processes that are accompanied by or catalyzed by the emission or absorption of visible light or ultraviolet radiation. A molecule in its ground (unexcited) state can...Browse by Subject
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