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Tourgée, Albion Winegar

(Encyclopedia)Tourgée, Albion Winegar to͝orzhāˈ [key], 1838–1905, American author and lawyer, b. Williamsfield, Ohio, studied at the Univ. of Rochester. After serving in the Union army he was for a few years ...

Camerarius, Rudolph Jacob

(Encyclopedia)Camerarius, Rudolph Jacob kămərârˈēəs, Ger. ro͞oˈdôlf yäˈkôp käməräˈrēo͝os [key], 1665–1721, German botanist and physician. The first to present a clear and definite picture of sex...

period, in physics

(Encyclopedia)period, in physics: see harmonic motion; wave. ...

Huggins, Sir William

(Encyclopedia)Huggins, Sir William, 1824–1910, English astronomer. Using a spectroscope, he began to study the chemical constitution of stars from the observatory attached to his home in Tulse Hill, London. He pr...

Gill, Sir David

(Encyclopedia)Gill, Sir David gĭl [key], 1843–1914, Scottish astronomer, educated at the Univ. of Aberdeen. He made observations of the transits of Venus and Mars and investigated the solar parallax. As astronom...

Gabor, Dennis

(Encyclopedia)Gabor, Dennis, 1900–1979, Hungarian-born British physicist, Ph.D. Berlin Institute of Technology 1927. Gabor was a researcher with the Thomson-Houston Company, England, from 1934 to 1949 and a profe...

nastic movement

(Encyclopedia)nastic movement, in botany, the movement of plant parts in response either to certain external stimuli or to internal growth stimuli. Nastic movements, which are generally slow, can be observed by tim...

Ray, Man

(Encyclopedia)Ray, Man, 1890–1976, American photographer, painter, and sculptor, b. Philadelphia. Along with Marcel Duchamp, Ray was a founder of the Dada movement in New York and Paris. He is celebrated for his ...

dimension, in physics

(Encyclopedia)dimension, in physics, an expression of the character of a derived quantity in relation to fundamental quantities, without regard for its numerical value. In any system of measurement, such as the met...

Mach's principle

(Encyclopedia)Mach's principle mäks [key] [for E. Mach], assertion that the inertial effects of mass are not innate in a body, but arise from its relation to the totality of all other masses, i.e., to the universe...