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AIR SURVEY CAMERAS
AUXILIARY INSTRUMENTS FOR AIR SURVEY
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adjustable aerial Aerotopo-Carl Zeiss angle attached Autograph automatic axis base carriage carried centre connected consists coordinates correction corresponding counter designed determination device diapositives differences direction displaced distance distortion drawing electric elements enlargement equipment exposure eyepieces field film fixed focal length frame glass graph Heerbrugg height horizon camera horizontal illumination inches instrument knob lamp lens lenses light lines magnification mark maximum means measuring measuring mark mechanical mirror motions mounted moved necessary negative Nistri Oberkochen objective observation obtained operator optical orientation parallax photographs placed plane plate plotting points position possible precision principal printer printing produced projection projectors radial range recording rectifier relative restitution rods rotated scale screw setting shutter side speed stereo stereoscope survey camera switch telescope tilt tion tracing unit vertical Wild