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theodolite |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.07 sec. |
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theodolite (thēŏd`əlīt'), calibrated optical instrument used to determine relative position in surveying surveying, method of determining accurately points and lines of direction (bearings) on the earth's surface and preparing from them maps or plans. Boundaries, areas, elevations, construction lines, and geographical or artificial features are determined by the ..... Click the link for more information. , navigation, and meteorology. It is similar in construction to a surveyor's transit, consisting of a telescope fitted with a spirit level and mounted on a tripod so that it is free to rotate about its vertical and horizontal axes. (Sometimes two or more telescopes of different magnifications are used.) Graduated scales are used to measure the amount of rotation about the axes. Measurements of the altitude and azimuth of a weather balloon weather balloon, balloon used in the measurement and evaluation of mostly upper atmospheric conditions (see atmosphere ). Information may be gathered during the vertical ascent of the balloon through the atmosphere or during its motions once it has reached a ..... Click the link for more information. at precise time intervals are used to compute the estimated wind velocity of the atmosphere. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The Military Topographical Service was provided with high-precision radio distance finders, theodolites and other geodetic devices. Meteorological crews sounded the atmosphere with pilot balloons and manual theodolites and then "cut" ballistic winds on a chart to extract zoned atmospheric information to apply to the gunnery solutions. The measurement technologies employed include laser-ranging devices, theodolites, large-scale coordinate measuring machines (CMMs), optical- and ultraviolet-light microscopes, scanning electron microscopes (SEMs), atomic force microscopes (AFMs), and scanning tunneling microscopes (STMs). |
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