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Updated: August 24, 2026
Over the lower end of this he held a plumb bob, and took the angle between the perpendicular line of the bob-string and the inclined line of the rod with a small protractor that he carried in his notebook. The angle measured over fifty degrees from the horizontal. Having thus determined the angle of inclination, the engineer picked a likely line of ascent and started to climb the gulch chute.
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