. Report of the Boundary commission upon the survey and re-marking of the boundary between the United States and Mexico west of the Rio Grande, 1891-1896 ... A Heliotrope S A 14. Monument No 11 Monument No 15 R«place(l by tangentNo ■> ■ ru 11 Monument No. !.>... stronomical No. 2. TANGENT NO. 2. ,970. 3919, .00 I TANGENT NO. Monument No 15 —,, 470. 7734,, * to. 00 31 47 0. 21 Heliotrode 1 A + 3146 +
. Report of the Boundary commission upon the survey and re-marking of the boundary between the United States and Mexico west of the Rio Grande, 1891-1896 ... A Heliotrope S A 14. Monument No 11 Monument No 15 R«place(l by tangentNo ■> ■ ru 11 Monument No. !.>... stronomical No. 2. TANGENT NO. 2. ,970. 3919, .00 I TANGENT NO. Monument No 15 —,, 470. 7734,, * to. 00 31 47 0. 21 Heliotrode 1 A + 3146 + + * Assamed coustant between given points. \ In direct ratio between given points 136 UNITED STATES AND MEXICAN BOUNDARY. Tanncnl data—Contiuued. TANGENT NO. 5. Station. Offset N. Latitude. Back-azimuth error. Tangent error. Name. Number. Measured. Assumed.* Measured. N. Assumed. ,,,«, 31 46 58. 00 + + 1-7+ Monument No 3 Monument \o. ■ 3146 + •Indirect ratio. t As square uf distance. MONUMENT The diagram intended to indicate the geometrical conditions governing the location of themouumeiit curve joining any two consecutive existing (old) monuments, and is almost self-explana-tory. The diagram, as will be seen, shows different conditions, all of which would not exist inany one case. The two tangents shown correspond to the two cases of error by which a tangentmay be affected. The two monument curves represent two cases, depending on which terminalmonument is farthest north. The computed ottset from the tangent as run to the true parallelthrough one monument is increased or decreased by the distance between the monument curveand parallel at the given point, and the distance between the parallel and monument curve isassumed to vary in direct ratio as distance from monument at intersection of the curves. Theoretical of
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherwashingtongovtprin
