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DISCUSSION
Mr. Crabtree: A very ingenious machine of this straight Hne type was described in ^'The Cinematograph Weekly" (Feb. 2, 1923). It differs from the conventional type insofar as the tubes are 30 to 40 feet long, extending into the third story. Such a machine occupies a very small area so that one man can look after it; and by making only a few steps he can observe both the developing and drying. The film is also dried in tubes instead of the usual open cabinet. I should like to ask Mr. Hubbard what he thinks of passing the film through a conditioning chamber after drying. Unless the air supply is carefully controlled by means of an expensive outfit the film will become too dry or too moist so that sometimes a lot of film is spoiled. Profit is largely determined by the absence of loss of film. By using fairly dry air, and then passing the film through a humidifying chamber to get it into equilibrium, with a 60% or 70% atmosphere, it would be insured that the film is in the correct condition after it leaves the machine. If too dry, the wearing qualities of the film are impaired; if too wet, it is likely to stick.
Mr. R. C. Hubbard: First in reference to the long tube, I am afraid Mr. Crabtree does not get the point of the principal objection to the straight line scheme; namely, the fact that your film during development is net easily observed. I have had the opportunity of seeing these machines in operation recently and I find when there is a change in speed due to printing or emulsion, that the operator has slight means of determining this accurately until the film has arrived at the examining light. In a machine with 30 foot tubes, he would have a chance to see the film about one sixth of the time. As far as space is concerned I believe it would be of greater advantage to confine the machine to a room 12 feet in height and for this reason I have recommended loops of 6 or 7 feet in length.
In regard to conditioning the film after it is dry, I don't beheve that any special apparatus would be necessary. Very often film does come from the machine in an improper state of dryness. However, all air in a film printing laboratory should be conditioned and as the film goes through the various processes of sorting, assembhng, examining, canning, etc. it would have plenty cf opportunity to arrive at a state of equilibrium with this conditioned air.
Mr. Vinton: There is one point against the long tube machine of Mr. Lawley's. It is most important to set and keep the tubes dead vertical, and even when correct the film becomes attached to the side of the tube and scratches on the emulsion result therefrom until this clinging ^of the film to the tube is discovered and the condition corrected. It is difficult to observe this condition until after the film
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