. Reports upon the survey of the boundary between the territory of the United States and the possessions of Great Britain from the Lake of the woods to the summit of the Rocky mountains . known. In examining the profile, the first general fact which strikes the eye isthat from the lowest point of the basin of the Red River to the foot of theRocky Mountains, a distance of about seven hundred and forty miles, thereis a gradual rise of about 3,425 feet, or an average of feet to the 49° --?-r, Ph.„,-:,„,_ EEPORT OF THE CHIEF ASTRONOMER. 267 But this profile is not drawn along the axis o
. Reports upon the survey of the boundary between the territory of the United States and the possessions of Great Britain from the Lake of the woods to the summit of the Rocky mountains . known. In examining the profile, the first general fact which strikes the eye isthat from the lowest point of the basin of the Red River to the foot of theRocky Mountains, a distance of about seven hundred and forty miles, thereis a gradual rise of about 3,425 feet, or an average of feet to the 49° --?-r, Ph.„,-:,„,_ EEPORT OF THE CHIEF ASTRONOMER. 267 But this profile is not drawn along the axis of greatest slope. The axialline of the Coteau of the Missouri extends from northwest to southeast,making nearly an angle of 45° with the meridian. As this Coteau consistsof a mass of drift deposited by icebergs grounding against the inclinedplane when in a state of submergence, it necessarily represents very nearlythe line of equal altitude, from which it follows that the line of greatestslope is in a direction from southwest to northeast. The general directionof the base of the Rocky Mountains also conforms to this view. It is thenevident that, taking into account both the large mountain-masses and thegeneral slope of the comparatively level country, the deflections should befound toward the southwest, and increasing from east to west, and that themean parallel, as determined from these stations, probably dips to the southat the western end. In considering the line more in
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherwashingtongovtprin
