Elements of military sketching and map reading (1917)
Barnes, John Bryson, 1876- · New York : D. Van Nostrand · leaf 25
A slope board is a simple device for measuring de-grees of slope. It is constructed as follows (Figs. 5and 6) : Suspend a small weight on a string, thus i6 ELEMENTS OF MILITARY SKETCHING forming a crude plumb-line and bob. Attach the freeend of the string to the middle point of one edge ofa… … near the bottom. If the level of the upper edge of theboard is disturbed by sighting the pendulum willappear to move forward or back of O. This apparentcourse of the pendulum (Fig. 6) is a sector that canbe divided into degrees. In the diagrams, from C toline A—B is assumed to be 5.7 inches, and…
Military topography · Maps, Military
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