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period, in physics

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

Leibl, Wilhelm

(Encyclopedia)Leibl, Wilhelm vĭlˈhĕlm līˈbəl [key], 1844–1900, German genre and portrait painter. He studied in Munich where numerous painters came under his influence; the “Leibl group” shared his pred...

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 ...

Freeman, Mary Eleanor Wilkins

(Encyclopedia)Freeman, Mary Eleanor Wilkins, 1852–1930, American author, b. Randolph, Mass. Her stories and novels paint a picture of Massachusetts and Vermont still under the influence of Puritanism, in her view...

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...

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...

looper

(Encyclopedia)looper, name for caterpillars that move with a looping motion, including the inchworm and the cabbage looper. ...

precession of the equinoxes

(Encyclopedia)CE5 Precession of the equinoxes (the points at which the earth's celestial equator intersects its ecliptic) is due to the slow rotation of the earth's axis around a perpendicular to the ecliptic. ...

Doppler effect

(Encyclopedia)Doppler effect, change in the wavelength (or frequency) of energy in the form of waves, e.g., sound or light, as a result of motion of either the source or the receiver of the waves; the effect is nam...