โ Scribed by F.M. Brown; L.L. Blackmer; C.J. Kunz
No coin nor oath required. For personal study only.
In the land-based radar direction of aircraft it was found necessary-to transfer to a large plotting screen a lox magnification of the PPI cathode-ray tube face . An instrument was developed to do this photographically, with the projected image lagging only i5 seconds behind the latest information . A single 360-degree sweep on the Pl'I tube is reduced to a i z-inch diameter image on Eastman Type 5302 Fine Grain Release Positive Film . The resultant image is rapid-processed by the application of hot solutions in a special processing cup which restricts the liquids to a small circular area on the film . The spent solutions are quickly removed by a vacuum line and the near dry image is indexed into the projection system where an air pressure gate completes the drying, cools the film, and holds it flat during projection . The projected image, at a magnification of over 300X, has sufficient quality to resolve all the pertinent detail of the tube face_ The method is felt to have some general application .
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Photographic Recording of Ballistic and other Rapid Phenomena with the Aid of the Quenched Spark. C. CRANZ and ]3. GLATZEL. (De~tsch. Phys. Gesell., xiv, IO, 525.)--After a brief review of the methods used earlier for recording photographically rapidly-occurring processes, such as ballistic phenome