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micrometer

(Encyclopedia)micrometer mīkrŏmˈətər, mīˈkrōmēˌtər [key]. 1 Instrument used for measuring extremely small distances. Typical examples are devices used in astronomical telescopes to measure the apparent d...

Moline

(Encyclopedia)Moline mōlēnˈ [key], city (1990 pop. 43,202), Rock Island co., NW Ill., on the Mississippi River, in a coal area; inc. 1848. It is a transportation and industrial center, and has been a major produ...

mark

(Encyclopedia)mark, designation for the free village community that was supposed to have been the unit of primitive German social life. According to a theory formulated in the 19th cent. by Georg Ludwig von Maurer ...

Hertz, Heinrich Rudolf

(Encyclopedia)Hertz, Heinrich Rudolf hĕrts [key], 1857–94, German physicist. He confirmed J. C. Maxwell's electromagnetic theory and in the course of experiments (1886–89) produced and studied electromagnetic...

Coulomb, Charles Augustin de

(Encyclopedia)Coulomb, Charles Augustin de ko͞oˈlŏm, ko͞olŏmˈ, Fr. shärl ōgüstăNˈ də ko͞olôNˈ [key], 1736–1806, French physicist. In 1789 he retired from his posts as military engineer and as super...

ephemeris time

(Encyclopedia)ephemeris time (ET), astronomical time defined by the orbital motions of the earth, moon, and planets. The earth does not rotate with uniform speed, so the solar day is an imprecise unit of time. Ephe...

Fernández de Córdoba, Francisco, d. 1526?, Spanish conquistador

(Encyclopedia)Fernández de Córdoba, Francisco fränthēsˈkō fārnänˈdāth dā kōrˈdōbä [key], d. 1526?, Spanish conquistador. Sent in 1523 by Pedro Arias de Ávila to deprive Gil González de Ávila (d. 1...

town

(Encyclopedia)town, in the United States. In the New England states the town is the basic unit of local government. The New England town government's unique feature is the town meeting, much praised as a nearly pur...

Svoboda, Ludvík

(Encyclopedia)Svoboda, Ludvík lo͝odˈvĕk svôˈbôdä [key], 1895–1979, Czechoslovak general and political leader. Svoboda served in the Czech Legion in World War I and became an officer (1922) in the army of ...

Young's modulus

(Encyclopedia)Young's modulus [for Thomas Young], number representing (in pounds per square inch or dynes per square centimeter) the ratio of stress to strain for a wire or bar of a given substance. According to Ho...