Basic Field Manual ...: Military courtesy. chapter 2. Personal hygiene. chapter 3. Equipment. chapter 4. Physical training. chapter 5. Map and serial photograph reading. chapter 6. Sketching. chapter 8. Defence against chemical attack. chapter 9. Scouting
U.S. Government Printing Office, 1929
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aerial photographs angle appear approximately azimuth base direction base position camera circle compass constructed contour convenient coordinates corresponding declination designated desired determine difference direction distance division draw drawn east edge effect elevation equal Example expressed feet field Figure geographic given graduations graphic scale grid lines grid north ground height horizontal hour identifiable inches indicated inspection intersection interval intervisibility joining latitude length lens line of sight magnetic magnetic north mark means measure meridian method miles military grid mosaics nearest needle object observer oriented parallel plot printed protractor reading rectangular relief represented respect road rubber band scale seconds selected shadow showing shown side single slope sought standard stereoscopic straightedge subdivisions survey terrain tilt tion true true north turn units vertical visible Y-grid line yards zone