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screw

(Encyclopedia)screw, simple machine consisting essentially of a solid cylinder, usually of metal, around which an inclined plane winds spirally, either clockwise or counterclockwise. It is used to fasten one object...

Guelphs

(Encyclopedia)Guelphs gwĕlfs [key], European dynasty tracing its descent from the Swabian count Guelph or Welf (9th cent.), whose daughter Judith married the Frankish emperor Louis I. Guelph III (d. 1055) was made...

nonlinear dynamics

(Encyclopedia)nonlinear dynamics, study of systems governed by equations in which a small change in one variable can induce a large systematic change; the discipline is more popularly known as chaos (see chaos theo...

Kiowa

(Encyclopedia)Kiowa kīˈəwə [key], Native North Americans whose language is thought to form a branch of the Aztec-Tanoan linguistic stock (see Native American languages). The Kiowa, a nomadic people of the Plain...

chlorate

(Encyclopedia)chlorate pərklōrˈāt, –klôrˈ– [key], salts of chloric acid, HClO3, and perchloric acid, HClO4, respectively. Perchlorates are safer to handle than chlorates; they are more stable when expos...

fingerprint

(Encyclopedia)fingerprint, an impression of the underside of the end of a finger or thumb, used for identification because the arrangement of ridges in any fingerprint is thought to be unique and permanent with eac...

pulley

(Encyclopedia)CE5 Pulleys: The mechanical advantage (MA) of a system of pulleys is equal to the number of supporting strands: in A MA=1 and in B MA=2. pulley, simple machine consisting of a wheel over which a r...

Tyrol

(Encyclopedia)Tyrol tĭrˈŏl, tīrōlˈ [key], Ger. Tirol, region and province (1991 pop. 631,410), 4,882 sq mi (12,644 sq km), W Austria. Innsbruck is the capital. The southern section of the historic region are ...

Ryukyu Islands

(Encyclopedia)Ryukyu Islands rēo͞oˈkyo͞o [key], Jap. Ryukyu-retto or Nansei-shoto [southwest group], archipelago (1990 est. pop. 1,500,000), c.1,850 sq mi (4,790 sq km), SW Japan, in the W Pacific Ocean. The ch...

Saarland

(Encyclopedia)Saarland zärˈlänt [key], state (1994 pop. 1,080,000), 991 sq mi (2,567 sq km), SW Germany; formerly called the Saar or the Saar Territory. Saarbrücken is the capital; other cities include Völklin...