International projectionist (Jan 1941-Dec 1942)

■"vf ti er <£ rer/noMO/ni OJECTK With Which is Combined Projection Engineering Edited by Aaron Nadell Volume 17 MARCH 1942 Number 3 Index and Monthly Chat 5 Projection Room Uses of Tube Data 7 Leroy Chadbourne Color of Light on the Projection Screen 10 M. R. Null W. W. Lozier D. B. Joy IA's June Convention to Pass on Proposed Changes in Constitution 13 To the Colors 15 Optical Illusions Producing Three Dimensional Effects . . 16 Theodore M. Edison Conserving Critical Materials in the Projection Room 19 "Last Straw" Treatment of Projector Emergencies 21 News Notes Technical Hints Miscellaneous Items Published Monthly by JAMES J. FINN PUBLISHING CORPORATION 580 FIFTH AVENUE, NEW YORK, N. Y. Circulation Manager, Ruth Entracht Subscription Representatives Australia: McGills, 183 Elizabeth St., Melbourne New Zealand: Te Aro Book Depot, Ltd., 64 Courtenay Place, Wellington England and Dominions: Wm. Dawson & Sons, Ltd., Pilgrim St., London, E. C. 4. Yearly Subscription : United States and possessions, $2 (two years, $3) ; Canada and foreign countries, $2.50. Single copies, 25 cents. Changes of address should be submitted two weeks in advance of publication date to insure receipt of current issue. Entered as second-class matter February 8, 1932, at the Post Office at New York, N. Y. under the act of March 3, 1879. International Projectionist is not responsible for personal opinions appearing in signed articles in its columns. Monthly Chat UNLESS all signs mislead, the projectionist is about to face the same necessity that confronted him in the early days of sound — namely, the compulsion to increase his general stock of information along lines that previously were of no practical importance to him. Two entirely different forces seem to be operating to place this necessity for more education on projectionists at the present time. One is the emergency itself. Shortages of vital materials will result in the use of more or less unsatisfactory substitutes in some projection room supplies — and the feller who puts on the show will have to struggle along with that handicap. The troubles resulting therefrom, and some slowness in shipping replacements, some shortage of loan equipment, will increase the projectionists' responsibility for more careful routine maintenance and inspection, and call on him for greater ingenuity in making emergency repairs. But a second factor, to which all farseeing men will pay careful attention, is the strong likelihood, amounting to practical certainty, that new and revolutionary techniques will come out of this war, and eventually find their way into projection. The last war created radio as a mass industry, with talking pictures as an inevitable offshoot. That television as a mass industry — including theatre television — will follow this war, and utilize techniques now secretly being developed for military use, is at least highly probable. But what else may develop can no more be predicted now than radio or talkies could have been foretold in '17. Improvements in optical practices suggest themselves as a possible result of intensive research now going into bombsights and the like; revolutions in amplification may grow out of wartime communications science, and so on. Neither the projectionist nor anyone else — not even the men now doing military researches — can say today what the American projection room will be like technically five years after the war ends. Nor can the projectionist study today the details of those techniques he will need five years hence. What he can do, and the times seem to be imposing the obligation upon him, is to study more intensively and thoroughly than ever in the past, the principles of optics in general, and of amplification in general, and so on. He can't get more details now. He can and must get more background now — both to meet his responsibilities during the war and to be prepared for the surprises that will come when it is over. Any dissenting votes? MARCH, 1942