. Bericht der Boundary commission über die Erhebung und Neumarkierung der Grenze zwischen den Vereinigten Staaten und Mexiko westlich des Rio Grande, 1891-1896 ... 0 Tupical Jem. Fij. S. Temp. r, n /ai oF Dishtrianct-Kurven,Si Not/ta,. Text, A cm. / / Juni I-2893. / 9 z 3.- S-3 LaiW. X = Distanz.Y=AMJ.Unide. ^& ^ r-^S TF. Achse von < 4 cm. 74^ J/30 3 cm. / / / i cm. Abb. 6. / / /■ y 4.^4.4S / TUI M.Cfuri ateMts... es,rix.. Icm. ^ / ^^ X 1893. ^ ^ =,=^ ^ -- j :--S-AO- BIF. S X Y f 8.3/ /. 3 cm. / / A tut M.Curiat EMFs... es. Bern. Abb. 7. /. 1893. Icm.. ^- ,^ y 7 7./S *- ^-^ ^ X / 0 Lo 0 36 0 4

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. 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 ... 0 Tupical Jem. Fij. S. Temp. r, n /ai°F. Dishtrianct Curves, Si not/ta, . Tex., a cm. / / June I-2893. / 9 z 3.- S-3 LaiW. X = Distance.Y=Amj.Unide. ^& ^ r-^S TF. Axis Of < 4 cm. 74^ J/ 30 3 cm. / / / I cm. Fig. 6. / / /■ y 4.^4.4S / Tui M.Cfuri ateMts... es, rix.. Icm. ^ / ^^ X 1893. ^ ^ =, =^ ^ -— __j :—-S-ao- BiF. s X Y f 8.3/ /. 3cm. / / A Tut M.Curiat eMfs... es. Bern. Fig. 7. /. 1893. Icm.. ^- , ^ y 7 7./S *- ^-^ ^ X / 0 lO 0 36 0 40 0 s 0 so 0 7C 0 a-c OMetres. Figs. 5, 6, ami 7— Typical ilisturbancK curves showiDg effect of hour of day and length of sight (degree of unsteadiness. X=distance of sight. r= amplitude of vibration. 214 UNITED STATES AND MEXICAN BOUNDARY. The effect of both leugth of sight and hour of day is more clearly seen by reference to Fig. 8.Here the values of *■ are the hours of the day and those of y the amplitudes of the vibratiou ofthe line of sight. This curve may be said to be typical of sunny days during all except thecold winter months.. Y Fig.9. 1 Ale. mrr.Ar 17.., 4 cm. Tei ^P.8sn Sun bn iht. V^e/a, 3 cm. / 2 cm. / Sun ob -.cured. %^3 -^ ^^^^ ^ X n >0 2t V .ic 0 9i 0 s^ W Metre s. T—amplitude of vibration. During a cloudy day, even with high temperature, but little unsteadiness is observetl, andthe curve representiug the unsteadiness through the day would be a very Hat one. The effect of different amounts of clouds on this unsteadiness is clearly shown by fig. 9, whichrecords a measurement of it at the same hour of different days, under almost exactly the sameconditions (soil, vegetation, temperature, etc.), but differing in the amount of clouds present when UNITED STATES AND MEXICAN liOUNDAKY. 215 the test was made. It will be seen that with the suu entirely obscured the curve is a straightline, with a bright sun an abrupt curve, and with the sun partly obscu

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