Practical cinematography and its applications (1913)

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RADIO-CINEMATOGRAPHY 153 With this seemingly complicated apparatus it was possible to take any desired number of successive pictures and at any intervals of time with unerring precision. For these particular experiments a special film was prepared, for the pictures produced by the standard camera were not large enough. Monsieur Carvallo took pictures of a depth of 2f inches instead of the usual f inch. Special arrangements were made also to secure extreme sensitiveness of the emulsion so that it might be more susceptible to the action of the X-rays. The disposition of the film followed special lines, as may be seen by reference to the diagram (Fig. 9). The Crookes tube, containing the X-rays, was placed beneath a table provided with an aperture upon which was laid a trans- parent medium, such as glass, to support the subject under investigation. Above this was placed the gate through which the film was moved intermittently, the sensitized ribbon travelling in a horizontal direction from one spool to the other. In the early experiments a Maltese cross movement was incorporated to provide the requisite intermittent motion to the film, but subsequently a novel claw motion devised by Monsieur Nogues, the mechanician to the Marey Institute, was introduced with far better results.