Elements of military sketching and map reading (1917)
Barnes, John Bryson, 1876- · New York : D. Van Nostrand · leaf 46
CONTOURS AND CONTOURING 37 Fig. 23. … Fig. 24. 38 ELEMENTS OF MILITARY SKETCHING plotted to scale on a map. ^I.D. is, therefore, theplotted horizontal or level distance between adjacentcontour lines. (Alap Distance is always measuredperpendicularly to the contour at that particular point.)Vertical Interval (abbreviated V.I.) is the…
Military topography · Maps, Military
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