| 单词 | collimation |
| 例句 | You get bright images of deep-sky objects like galaxies, but the mirrors may require an adjustment called collimation. How to enjoy the big and bright stars at night in Texas 2015-10-18T04:00:00Z Collimā′tor, a subsidiary telescope used to detect errors in collimation, when adjusting for transit observations. Chambers's Twentieth Century Dictionary (part 1 of 4: A-D) 2011-10-11T02:01:08.990Z The collimation and level errors are very carefully determined before and after these observations, and it is usual to arrange the observations by the reversal of the telescope so that collimation error shall disappear. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z In this case the vertical component depends upon the reading of the declination circle, and the horizontal component gives the error of collimation. Photographs of Nebul? and Clusters Made with the Crossley Reflector 2011-06-21T02:00:27.500Z “The collimation issue is something that technologists are quite aware of and has been emphasized for decades,” Dr. Frush said. The Radiation Boom: X-Rays and Unshielded Infants 2011-02-28T03:00:48Z The objective is mounted in the most approved manner and is provided with adjustment for collimation. Astronomical Instruments and Accessories Thus the line of collimation of the telescope was placed at right angles to the surface of the mirror. Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis If b, c be the level and collimation errors, the correction to the circle reading is b cot z � c cosec z, b being positive when the west end of the axis is high. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z The adjustment is effected by means of clamping and butting screws on the eye-end, and a change of the line of collimation, with respect to the finders and the circles, is avoided. Photographs of Nebul? and Clusters Made with the Crossley Reflector 2011-06-21T02:00:27.500Z It consists of spider webs set within a graduated metallic circle, the webs movable by screws, and the whole instrument capable of rotating about the collimation axis of the telescope. Scientific American Supplement, No. 288, July 9, 1881 The collimation error was found by reversing the instrument and using a terrestrial mark, the azimuth error by star observations. History of Astronomy The clock correction being known from the records kept at the Observatory, the collimation and azimuth constants were found by the usual formulæ. Photographs of Nebul? and Clusters Made with the Crossley Reflector 2011-06-21T02:00:27.500Z |
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