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heliograph

(Encyclopedia)heliograph hēˈlēəgrăf [key] [Gr.,=sun-writer], signaling device using flashes of sunlight. It has two mirrors that are used to reflect sunlight on a distant point and a shutter through which the ...

Chambord, Henri Charles Ferdinand Marie Dieudonné, comte de

(Encyclopedia)Chambord, Henri Charles Ferdinand Marie Dieudonné, comte de äNrēˈ shärl fĕrdēnäNˈ märēˈ dyödônāˈ kôNt də shäNbôrˈ [key], 1820–83, Bourbon claimant to the French throne, posthumo...

Lewis, Clarence Irving

(Encyclopedia)Lewis, Clarence Irving, 1883–1964, American philosopher, b. Stoneham, Mass., grad. Harvard (B.A., 1906; Ph.D., 1910). After teaching (1911–20) at the Univ. of California, he was professor of philo...

note, in music

(Encyclopedia)note, in musical notation, symbol placed on or between the lines of a staff to indicate the pitch and the relative duration of the tone to be produced by voice or instrument. The largest note value in...

mathematical logic

(Encyclopedia)mathematical logic: see symbolic logic. ...

Weaver, Warren

(Encyclopedia)Weaver, Warren, 1894–1978, American scientist, b. Reedsburg, Wis., grad. Univ. of Wisconsin. He taught mathematics at Wisconsin (1920–32), was director of the division of natural sciences at the R...

taffeta

(Encyclopedia)taffeta, cloth, originally silk but now also made of synthetic fibers, supposed to have originated in Persia. The name, derived from Persian, means “twisted woven.” Taffeta is in the same class an...

ceremony

(Encyclopedia)ceremony, expression of shared feelings and attitudes through more or less formally ordered actions of an essentially symbolic nature performed on appropriate occasions. A ceremony involves stereotype...

Frege, Gottlob

(Encyclopedia)Frege, Gottlob gôtˈlōp frāˈgə [key], 1848–1925, German philosopher and mathematician. He was professor of mathematics (1879–1918) at the Univ. of Jena. Frege was one of the founders of moder...

MacKinnon, Roderick

(Encyclopedia)MacKinnon, Roderick, 1956–, American biochemist, b. Burlington, Mass., M.D. Tufts Univ., 1982. MacKinnon was on the faculty at Harvard Medical School from 1989–96 and has been a professor at the H...