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aerial camera aerial photographs air station airplane altimeter angle of tilt azimuth Bausch and Lomb computations cone contact prints contour control points control stations correction corresponding datum plane determine developing displacement distance elevations employed equal equation equipped error exposure feet Figure film flight lines focal length focal plane give glass plate graph grid height horizon line horizontal plane image points inches instrument intersection latitude lens lenses light loaded magazine located magazine Mark Hurd measured method miles millimeter minutes minutes of arc mosaic mount necessary negative objects oblique obtained operation optical axis orientation overlap pair parallax parallel perpendicular perspective center photographs taken placed plumb line position practicable principal line principal point printing projection projector proper radial-line reel satisfactory scale setup shutter side single-lens solution spool stereo base stereoscope Survey telescope terrain tion triangle U.S. Geological Survey vertical photographs vertical point