Abstract
A compound stereoscope is described having facilities for (a) measuring parallax displacements and correspondence errors on vertical stereo air photographs, (b) measuring the rectangular co-ordinates of images on air photographs, (c) plotting air bases and minor control in strips of air photographs, (d) plotting to a predetermined scale planimetric detail in untilted or rectified vertical air photographs, (e) plotting form lines by the "floating mark" method.
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