MAP-MAKING from aerial photographs: By means of the precision stereoscope on the left the heights of features shown in the aerial photographs can be calculated, and the contours plotted directly on to the paper on the right. The apparatus shown is known as a "stereocomparagraph"
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New Zealand Listener, Volume 15, Issue 380, 4 October 1946, Page 6
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45MAP-MAKING from aerial photographs: By means of the precision stereoscope on the left the heights of features shown in the aerial photographs can be calculated, and the contours plotted directly on to the paper on the right. The apparatus shown is known as a "stereocomparagraph" New Zealand Listener, Volume 15, Issue 380, 4 October 1946, Page 6
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