A Treatise on Practical Astronomy: As Applied to Geodesy and Navigation |
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Page vii
... micrometer . Eccentricity of graduated circles ...... The sextant .... The prismatic sextant .. Adjustments of the sextant .. Method of observing .... Index error ..... Eccentricity of the sextant ... The chronometer .... Comparison of ...
... micrometer . Eccentricity of graduated circles ...... The sextant .... The prismatic sextant .. Adjustments of the sextant .. Method of observing .... Index error ..... Eccentricity of the sextant ... The chronometer .... Comparison of ...
Page ix
... micrometer screw . 488 Value of micrometer when level is not known .. 493 General formulæ for latitude ...... .. 501 The corrections for micrometer , level , and refraction .. 502 Reduction to the meridian ... ... 504 Combination of ...
... micrometer screw . 488 Value of micrometer when level is not known .. 493 General formulæ for latitude ...... .. 501 The corrections for micrometer , level , and refraction .. 502 Reduction to the meridian ... ... 504 Combination of ...
Page 176
... micrometer - threads for reading the circle . The micrometer ( Fig . 16a ) consists of a frame of brass , across which are stretched two spider - lines . Sometimes these lines make an acute angle with each other , as shown in the figure ...
... micrometer - threads for reading the circle . The micrometer ( Fig . 16a ) consists of a frame of brass , across which are stretched two spider - lines . Sometimes these lines make an acute angle with each other , as shown in the figure ...
Page 177
... MICROMEter . I M FIG . 16. THE READING MICROSCOPE . the microscope , this division of space may be carried to an almost unlimited extent . For the purpose under considera- tion , however , we should soon reach a limit beyond which ...
... MICROMEter . I M FIG . 16. THE READING MICROSCOPE . the microscope , this division of space may be carried to an almost unlimited extent . For the purpose under considera- tion , however , we should soon reach a limit beyond which ...
Page 178
... micrometer reading to single seconds . If now the revolu- tion of the instrument has brought the scale into the position shown in Fig . 17 , we see from the position of the threads that the entire angle passed over is between 45 ° 15 ...
... micrometer reading to single seconds . If now the revolu- tion of the instrument has brought the scale into the position shown in Fig . 17 , we see from the position of the threads that the entire angle passed over is between 45 ° 15 ...
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Common terms and phrases
accuracy altitude angle applied approximation arithmetical mean ascension and declination axis azimuth Bessel catalogue celestial sphere centre chronograph chronometer circle circumpolar stars clamp co-ordinates coefficients collimation computation constant convenient culmination determined difference differential dt dt earth east ecliptic elongation emersion ephemeris equal example follows formulæ geocentric given gives Greenwich horizon hour-angle instant latitude limb logarithms longitude mean solar measured meridian method micrometer middle thread moon moon's right ascension multiplied Nautical Almanac obtained occultation parallax plane position prime vertical probable error proper motion reading reduced refraction right ascension screw semidiameter sextant sidereal sin² star's stars observed Substituting subtract telescope tion transit instrument unknown quantities values vernier weight write zenith distance ΙΟ
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