Elementary map and aerial photograph reading Page: 75
116 p., ill., diagrs., maps Enclosed at end: Change 1 (20)View a full description of this book.
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Figure 96,
point, for example the building at the mine. Sight
through the compass, line up the building with the hair
line in the compass (fig. 94), and read the azimuth
through the glass eyepiece, which is 3050.
Fourth: Lay your compass on your map, with the tip
of the cover at the mine (fig. 95). Be sure that your map
is oriented with the north arrow of the compass. Then
pivot the compass slowly until the azimuth of 305 lines
up with the hair line. Make two marks on the map, one
at each end of the compass, remove the compass, and
connect the two marks with a line.
Fifth: This azimuth is a forward azimuth; however,
we are back of the house, therefore, we want a back azi-
muth. To get this a line is carried straight back, as in
figure 95. If we put the compass on the line again, we
can see that the back azimuth of 3050 is 1250.Figure 97.
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United States. War Department. Elementary map and aerial photograph reading, book, August 15, 1944; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc96653/m1/81/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.