The gastric motor phenomena demonstrated with the projecting kinetoscope : with description of rapid film-changing device / by Lewis Gregory Cole.

  • Lewis Gregory Cole
Date:
1912
Catalogue details

Licence: In copyright

Credit: The gastric motor phenomena demonstrated with the projecting kinetoscope : with description of rapid film-changing device / by Lewis Gregory Cole. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    box and cannot be shown on photograph) so that as the handle of the device makes a half turn the pasteboard tube “K” makes a full turn which just winds up 8 inches of film. On the other end of the apparatus there is an electro-magnet “A” having a silver contact mounted on the plunger and an- other silver contact mounted on an adjustable screw. This electro-magnet is placed in series with the electro-magnet WD” that throws the intensifying screen up against the sensitive film so that they both work at the same instant. On the connecting rod “L” between the ratchet arrangement that winds up the film is placed a spring contact “B” which closes the current through both electro-magnets. The cur- rent from the primary of the X-Ray apparatus is closed when the two silver contacts operated by “A” come together. Both electro-magnets are operated by the same set of storage batteries or dry cells. The apparatus operates in the following manner: The first half-turn of the crank winds the film. When the crank is turned three-quarters round, the spring contact “B” is closed which operates the electro-magnets “A” and “D,” closing the current through the primary of the X-Ray appar- atus, at the same instant pressing the intensifying screen firm- ly against the sensitive film above it. Then just before com- pleting the revolution of the handle the battery circuit through the above electro-magnets is broken so that the current from the X-Ray apparatus is turned off and the intensifying screen drops back away from the sensitive film. The above cycle of events takes place with every complete revolution of the handle which can be operated by hand or an electric motor. The apparatus, of course, has to be loaded in a dark room or the rolls well covered with black paper, similar to the regular film roll, used in an ordinary camera.
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