Elements of military sketching and map reading (1917)
Barnes, John Bryson, 1876- · New York : D. Van Nostrand · leaf 27
Fig. 6. by the pendulum (Figs. 7 and 8). Forward is a minusand backward is a plus elevation. It is usually moreconvenient to use both hands in sighting and to holdthe plumb-line in place against the board with the leftthumb when it is turned to be read. The slope boardis constructed on the under… … SOME SKETCHING INSTRUMENTS 19 in windy weather. The Service Clinometer is a simpleand handy angle measuring instrument, and should beused when available.A 6-inch triangular ruler makes a good straightedge
Military topography · Maps, Military
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