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464 Transactions of SM.P.E., Vol XIII, No. 38, 1929
2. Heinz Eosenberger, Der Kapillarograpli, Die Kinoteolinilc, 1925, vii, 585.
3. J. Hamilton Crawford and Heinz Roseuberger, Studies on human capillaries, The Jmirnal of Clinical Investigation, 1926, ii, 343-374.
4. Heinz Rosenberger, Micro motion pictures, Scientific American, March, 1927.
5. Heinz Rosenberger, Micro-cinema in medical research, Transactions of the Society of Motion Picture Engineers, 1927, xi, 750.
6. Heinz Rosenberger, Der Kapillarograph, Milcrolcosmos, 1927-28^ xxi, 120.
7. Heinz Rosenberger, Mikro-Kimematographie im Dienste medizinischer Forschung, Die Kinotechnilc, 1928, x, 329.
DISCUSSION
Mr. Barrell : I don 't want to embarrass you with any details, but could you tell me about the cost of these two installations ?
Dr. Eosenberger : I think the equipment as drawn in the previous slide costs about $2500 and the latter one about $1500.
Mr. Malkames : Have you any means for focusing while photographing ?
Dr. Rosenberger : Yes, there are two means : the first is looking at the back of the film and observing the picture through the camera. The special camera, shown in the first slide is but 90 mm. [about 31/2"] high which is very convenient. The second way of focusing during the taking is through a so-called beam splitter, which is a cube consisting of two prisms one of which is slightly silvered, 95 per cent of the light goes through onto the film, while about 5 per cent is reflected into the tube and is of service for observation.
Mr. Malkames : What would be the disadvantage of using the regular objective on the camera focused at infinity and also focusing the microscope at infinity ?
Dr. Rosenberger : This can be done, but I try to avoid as much glass as possible in the beam of light.
Mr. Malkames: What would be the loss of light in such a system as the objective on the lens?
Dr. Rosenberger: The loss of light is negligible, but I think optical resolution is most important, and a great deal of resolving power is lost if there is too much glass in the beam of light.