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94 ~ Transactions of S.M.P.E., March 1926
this over a billion, and work is being done at the present time on the re-design of the mirror.
Mr. Ziebarth: We are using air for cooling the film in our Filmo projectors, which enables us to stop the machine and show still pictures. A description of this may be found in our 1924 Transactions in a paper by J. H. McNabb.
Mr. Richardson: That is true, but so far no attempt has been made to lessen the fire hazard with the high intensity or the reflector type lamps.
Dr. Hickman: This method of cooling film with a blast of air has been patented and cross-patented any number of times in the last four or five years. I have seen many different modifications none of the patent claims of which are valid, and there are a number of continental machines fitted with the devices. All the various patents are chronicled in the Kodak Abstract Bulletin or the R.P.S. "Photographic Abstracts," and I make a plea for a subscription to some such abstract journal by everybody connected with the industry, since it would save cross-patenting and cross-designing of what other people have done.
Mr. Griffin: This explains very well why the manufacturers do not go into this. No one is looking for lawsuits, and the apparatus as used today is quite satisfactory. The building of compressed air apparatus is costly and takes up room in the projection room; it is subject to breakdown. I think it will be a long time before the manufacturers adopt such an apparatus.
Mr. Richardson: I don't believe any costly apparatus is necessary. I think the thing could be taken care of bj^ a high speed electric fan with a proper air shoot. The reason I brought this up is that we have been using high power light sources and very hot spots in the last year or two.