. Transactions of the Society of Motion Picture Engineers (1921) . agement of their plant early in1918. With these men in charge they made some useable opticalglass, but it was not up to the standard desired because of several de-fects, chief among which were the old furnaces, which were notprovided with regenerating chambers and the proper temperaturecontrol was impossible. This brings us to the efforts of the Spencer Lens two month after the outbreak of the war I went to Englandto pick up what optical glass I could which would be suitable to ourneeds. I succeeded in geting a l
. Transactions of the Society of Motion Picture Engineers (1921) . agement of their plant early in1918. With these men in charge they made some useable opticalglass, but it was not up to the standard desired because of several de-fects, chief among which were the old furnaces, which were notprovided with regenerating chambers and the proper temperaturecontrol was impossible. This brings us to the efforts of the Spencer Lens two month after the outbreak of the war I went to Englandto pick up what optical glass I could which would be suitable to ourneeds. I succeeded in geting a little and came back thoroughly con-vinced that wt must make our own glasss. In the summer of 1915we built one small furnace in our factory at Buffalo. We triedseveral different glass makers who were experienced more or less inordinary glass making, but all to no avail. Pot after pot, each aftera period of about two weeks consumed in slowly heating up the potin the furnace, making the glass, and then slowly cooling down fur-nace and glass, proved to be Fig. 0—Taking the Temperature of the Furnace In the Spring of 1916 we secured the services of Mr. Martin, abrother of the man working with the Bausch & Lomb Optical Co. Hesoon convinced us that he was a man of much greater ability in thisline than any we had had. After a number of experiments he con-vinced us also that optical glass was impossible with the equipmentthen in use. We then bought land in Hamburg—a suburb of Buffalo—where we could get an unlimited supply of natural gas. By March,1917, we had a modest plant running there with regenerator furnaceswith which we turned out a small amount of useable optical encountered great difficulties even with the better equipment. 41 We did improve both in quantity and quality, but not until we weregiven help from the Geophysical Laboratory did we really begin tomake optical glass successfully. Right here I take pleasure in quoting from a paper,* OpticalGlass
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