goniometer

Definitions

  • WordNet 3.6
    • n goniometer direction finder that determines the angular direction of incoming radio signals
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Webster's Revised Unabridged Dictionary
    • n Goniometer An instrument for measuring angles, especially the angles of crystals, or the inclination of planes.
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Century Dictionary and Cyclopedia
    • n goniometer An instrument for measuring solid angles, or the inclination of planes, particularly the angles formed by the faces of crystals. A. contact- or hand-goniometer consists of a graduated circle or half-circle, with two arms movable about a center, and either attached or free. The edges of these arms are brought in close contact with the two surfaces, and the angle is then read off on the graduated arc. A reflecting goniometer consists of a graduated circle supported in either a vertical or a horizontal position upon a stand, and provided, first, with a more or less elaborate arrangement for adjusting and centering the crystal to be measured, so that the intersection edge shall be exactly in the axis of rotation of the circle, and, second, with one or (better) two telescopes; in the latter case one serves to project a signal, as a hair cross, upon the surface to be measured, and the other to observe this signal as reflected. The angle through which the graduated circle—that is the crystal—must be revolved to make the signal visible, first from one plane and then from the other, is the supplement of the true internal angle between the two faces. A contact-lever goniometer is provided with a graduated circle, like the last form, but a point connected with a delicate lever-system takes the place of the telescopes and eye to fix the position first of one and then of the other plane.
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Chambers's Twentieth Century Dictionary
    • n Goniometer gō-ni-om′e-tėr an instrument for measuring solid angles, indispensable to the crystallographer.
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Etymology

Webster's Revised Unabridged Dictionary
Gr. angle + -meter,: cf. F. goniomètre,
Chambers's Twentieth Century Dictionary
Gōnia, an angle, metron, measure.

Usage

In literature:

Wollaston in 1812, with the aid of his newly invented reflective goniometer, to be 74 deg.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4" by Various
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In news:

Tri- axial Electro-goniometer for Spinal Motion Justyna Zielinska, Stevens Institute of Technology.
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In science:

Full angular critical current characteristics of coated conductors studied using a two-axis high current goniometer.
Stress dependence of the critical currents in neutron irradiated (RE)BCO coated conductors
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