Military sketching and map reading; including panoramic sketching and aerial photography (1921)
Grieves, Loren Chester, 1878- · Washington : United States Infantry Association · leaf 45
he profilel^ositions of each point, and, from the point of observation,draw tangents to each profile location and, if these linesfall below the profile location of the point in question, thatpoint is visible. Visibility of a Line Construct the profile of the line as previously explained.From a.… … o o V o o o CM C\J 4) — d) re<) > U. (I> Visibility 43
Maps, Military · Military sketching
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