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Errors art PAGE 1 Remarks
The Probable Error
Calculation of the Probable Error
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accuracy accurate adjusted alidade altitude azimuth benchmark bubble camera celestial celestial equator celestial sphere chorobates circle circuit closing error Coast and Geodetic computed contour contour line control points correction cross-hair difference in elevation dioptrae direction distance drawn elongation equator fixed formula gage Geodetic Survey given Gromatici ground control hence horizontal axis hour angle inches instrument interval latitude lens line of sight located longitude means measured meridian meter method object observed observer's perspective view photograph picture plane plane coordinates plate plotted plumb line Polaris position probable error procedure projection Prosser rays respect right ascension scale scale ratio sextant shown in Fig side sidereal slope standard star station stream sun's surface tape telescope templets tion transit transverse Mercator projection traverse triangle U. S. Coast upper culmination velocity vernier vertical angle weir