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Errors ART PAGE 1 Remarks
The Probable Error
Calculation of the Probable Error
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accuracy accurate adjusted aerial alidade altitude bubble camera celestial celestial equator celestial sphere chorobates circle Coast and Geodetic computed contour contour line control points correction cross-hair datum determined difference in elevation dioptrae direction displacement distance earth's equator formula gage Geodetic Survey given grid azimuth Gromatici ground height of lens hence horizontal axis hour angle instrument intersection interval latitude length line of sight located longitude means measured meridian meter method observed observer's parallax perpendicular photogrammetric photograph plane coordinates plate plotted plumb lines Polaris pole position principal point probable error procedure projection projector Prosser radial rays respect scale scale ratio sextant shown in Fig side sidereal standard star station stereoscopic stream sun's surface tape telescope templets tilt tion transit transverse Mercator projection triangle U. S. Coast velocity vernier vertical angle Wanda weir