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Jim Crow laws

(Encyclopedia)Jim Crow laws, in U.S. history, statutes enacted by Southern states and municipalities, beginning in the 1880s, that legalized segregation between blacks and whites. The name is believed to be derived...

pure-food laws

(Encyclopedia)pure-food laws: see food adulteration. ...

animated cartoon

(Encyclopedia)animated cartoon: see Nontheatrical Film under motion pictures. ...

aerodynamics

(Encyclopedia)aerodynamics, study of gases in motion. As the principal application of aerodynamics is the design of aircraft, air is the gas with which the science is most concerned. Although aerodynamics is primar...

Zeno of Elea

(Encyclopedia)Zeno of Elea ēˈlēə [key], c.490–c.430 b.c., Greek philosopher of the Eleatic school. He undertook to support in his only known work, fragments of which are extant, the doctrine of Parmenides by ...

Field, Rachel

(Encyclopedia)Field, Rachel, 1894–1942, American writer, b. New York City, educated at Radcliffe. Her books for children include The Cross-Stitch Heart and Other One-Act Plays (1927), Hitty: Her First Hundred Yea...

ratchet and pawl

(Encyclopedia)ratchet and pawl, mechanical device that permits motion in one direction only. The ratchet is usually a wheel with slanting teeth. The pawl is a lever tangential to the wheel with one end resting on t...

Phoebe, in astronomy

(Encyclopedia)Phoebe fēˈbē [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn IX (or S9), Phoebe is 137 mi (220 km) in diameter, orbits Saturn at a mean distance ...

red shift

(Encyclopedia)red shift or redshift, in astronomy, the systematic displacement of individual lines in the spectrum of a celestial object toward the red, or longer wavelength, end of the visible spectrum. The effect...

ballistics

(Encyclopedia)ballistics bəlĭsˈtĭks [key], science of projectiles. Interior ballistics deals with the propulsion and the motion of a projectile within a gun or firing device. Its problems include the ignition a...