Finch, James Kip, 1883- · New York : John Wiley & Sons, Inc. · leaf 141
Fig. 68.—Correction of an Upward Sight. the horizontal distance shall be in yards, and it is thereforenecessary to scale from the map the horizontal distances usedin determining the difference in elevation. Knowing thevertical angle and the horizontal distance the difference in … Fig. 69.—Correction of a Downward Sight. elevation is found by solving the right-angle triangle ABCof Fig. 53 for the side BC. That is, we may lay off the verticalangle BAC to scale and also the horizontal distance, and thenscale off the height BC. Or we may solve this triangle byproper…
Cartography · Military maps
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
