1 February 1974 Bore Hole Cameras
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Optical Engineering, 13(1), 130140 (1974). doi:10.1117/12.7971673
Descriptions of bore-hole cameras with several applications are presented. Their main feature is to inspect, by photographic recording, the walls of confined places, such as drillings in foundation and geological engineering, and inspection through small holes of restricted areas -as in medicine and industry. Development of a compact holographic system was achieved, which enables recording the three dimensions with high resolution and good contrast. It is believed that in the future, integrated optics will be applied, and micro-miniature photographic cameras will be developed for the mentioned and many other applications.
Jacob Politch, "Bore Hole Cameras," Optical Engineering 13(1), 130140 (1 February 1974). https://doi.org/10.1117/12.7971673

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