. Transactions of the Society of Motion Picture Engineers (1921) . atory did we really begin tomake optical glass successfully. Right here I take pleasure in quoting from a paper,* OpticalGlass and Its Future as an American Industry, written by Dr. Ar-thur L. Day, who was in charge of Optical Glass Production, WarIndustries Board. In contrast to this situation, and to the difficulties encounteredat Charleroi, it is interesting to consider the progress of the smallplant of the Spencer Lens Company, at Buffalo, in the same plant was new and though small was capable of competent con
. Transactions of the Society of Motion Picture Engineers (1921) . atory did we really begin tomake optical glass successfully. Right here I take pleasure in quoting from a paper,* OpticalGlass and Its Future as an American Industry, written by Dr. Ar-thur L. Day, who was in charge of Optical Glass Production, WarIndustries Board. In contrast to this situation, and to the difficulties encounteredat Charleroi, it is interesting to consider the progress of the smallplant of the Spencer Lens Company, at Buffalo, in the same plant was new and though small was capable of competent con-trol. Accordingly, production up to the existing capacity began inthe month of December and continued uninterruptedly thereafter un-til June, 1918, when it was approximately doubled by additionalbuilding, and in August, when it was doubled again. Two of themembers of the staff of the Geophysical Laboratory (Drs. Fennerand Bowen) went from the Rochester plant to start this furnace, andof the first 22 pots which were put through after their arrival not Pig, 4—A pot which has just been taken from the furnace—Ready to go intothe Pot Arch to cool. This tells the story better than I can. We progressed rapidly inquality and quantity. I am glad to say that before the armistice wewere making glass which was selected for some of the most particu-lar optical work at hand. Since the armistice we have kept steadilyat it, improving our quality and increasing the number of different* glasses made. In spite of the fact that the war demand was cut offwe have thus far been able to keep moderately busy. Since trade hasbeen opened with Europe, however, their glass has been coming in atsuch low prices that I do not know how much we will be able tomake, other than that which we use ourselves, if we do not get aproper protective duty. It would be a shame if an industry so suc-cessfully built up under such, adverse circumstances, and so vital to * Journal of the Franklin Institute, 19
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