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potentiometer

(Encyclopedia) potentiometer. 1 Manually adjustable, variable, electrical resistor. It has a resistance element that is attached to the circuit by three contacts, or terminals. The ends of the…

tritium

(Encyclopedia) tritiumtritiumtrĭtˈēəm [key], radioactive isotope of hydrogen with mass number 3. The tritium nucleus, called a triton, contains one proton and two neutrons. It has a half-life of 12.5…

Flacius Illyricus, Matthias

(Encyclopedia) Flacius Illyricus, MatthiasFlacius Illyricus, Matthiasməthīˈəs flāˈshəs ĭlĭrˈĭkəs [key], 1520–75, German Lutheran reformer, whose original name was Matthias Vlachich or Francowich, b.…

Gelasius I, Saint

(Encyclopedia) Gelasius I, SaintGelasius I, Saintjĭlāˈshēəs [key], d. 496, pope (492–96); successor of St. Felix III (also known as Felix II). He was a firm upholder of the papal supremacy in a…

Frémont, Jessie Benton

(Encyclopedia) Frémont, Jessie BentonFrémont, Jessie Bentonfrēˈmŏnt [key], 1824–1902, American author, b. Lexington, Va.; daughter of Thomas H. Benton and wife of John Charles Frémont. Her elopement…

Francia, José Gaspar Rodríguez

(Encyclopedia) Francia, José Gaspar RodríguezFrancia, José Gaspar Rodríguezhōsāˈ gäspärˈ rōᵺrēˈgās fränˈsyä [key], 1766–1840, dictator of Paraguay and creator of its national independence, known as…

Ginkel, Godart van, 1st earl of Athlone

(Encyclopedia) Ginkel, Godart van, 1st earl of AthloneGinkel, Godart van, 1st earl of Athlonegōˈdärt vän gĭngˈkəl [key], 1644–1703, Dutch general in the service of William III of England. He…

Vazov, Ivan

(Encyclopedia) Vazov, IvanVazov, Ivanĭvänˈ väˈzôf [key], 1850–1921, Bulgarian poet, novelist, and playwright, the first professional man of letters in Bulgaria. His work was inspired by the political…

wind shear

(Encyclopedia) wind shear, a sudden, drastic change in wind direction or speed over a comparatively short distance. Most winds travel horizontally, as does most wind shear, but under certain…

waveguide

(Encyclopedia) waveguide, device that controls the propagation of an electromagnetic wave so that the wave is forced to follow a path defined by the physical structure of the guide. Waveguides, which…