International projectionist (Jan-Dec 1946)

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V INTERNATIONAL 0JECTI0NIS1I With Which Is Combined Projection Engineering HENRY B. SELLWOOD, Editor Volume 21 FEBRUARY 1946 Number 2 Index and Monthly Chat Some Physical Properties of Film Relating to Image Stability . . 7 R. H. Talbot The New Ampro 16-mm Projector, II 12 Leroy Chadbourne We See Upside Down 14 Acetate vs. Nitrate Issue Revived 15 Basic Design Determines Projector Performance Arthur E. Meyer 16 In the Spotlight 18 Harry Sherman Projection Lens Aberrations . 20 Angelo Montani Basic Radio and Television Course XX — Transmitters 22 M. Berinsky At Your Service 25 Telecasts 29 Plastic Substitute for Optical Glass Seen 30 I. A. Elections 32 News Notes Technical Hints Miscellaneous Items Published Monthly by INTERNATIONAL PROJECTIONIST PUBLISHING CO., INC. 19 West 44 Street, New York 18, N. Y. R. A. ENTRACHT, Publisher 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. Entire contents copyrighted 1946 by International Projectionist Publishing Co., Inc. International Projectionist is not responsible for personal opinions appearing in signed articles in its columns. 420 MONTHLY CHAT pMLM exhibitors have never been con' spicuous for their interest in the technological standards of the industry— unless and until some topic bearing, however remotely, on theatre manpower hoves into view. When this happens, every exhibitor in America essays the role of a Ph.D. in science — all the sciences— usually with ludicrous results. The current exhibitor bleat in behalf of acetate film makes them hammier than ever. We don't object to exhibitors sounding off; but we do think that the prestige of the industry demands that they obtain competent technical advice before they cuff people around. The M.P.T.O.A. is welcome to the data anent the acetate vs. nitrate topic presented elsewhere in this issue — without charge. • • • The M.P.T.O.A. might better give serious consideration to other — and, we think, more pressing — problems currently confronting the industry, notably the threat to the box-office of television and of the projected circuit of 16-mm theatres, including mobile units. The 16-mm situation demands immediate attention, although television is on the wing and coming fast. If and when pressure from both these quarters is exerted simultaneously, as it will be, the pay of a projectionist will seem to be a comparatively small potato. Incidentally, has the M.P.T.O.A., or the Allied owners, or the producers ever spent an hour or a dollar to evaluate the position of the motion picture theatre in the television era? Developments such as these is the reason why I. P. is a craft publication no less than a technical journal. There are some things vastly more important than corporate quarterly earnings and weekly salary payments, and among these is long-range security, no less for the theatreman's investment than for the projectionist's weekly wage. So it is, I. P. readers, when you see in these pages items and articles that may not be classified as technical presentations— and we include in this category items relating to film company earnings, etc. — just remember that this bit of type helps to fill in the overall pattern and is a "function of I. P.'s service as a craft journal. The 16-mm people are very much alive to the possibilities of a national narrow-gauge exhibition circuit, the establishment of which would occasion no great surprise in this corner. All the major producers are preparing to make 16-mm prints, although they disclaim any intention to distribute them in the U. S. A. This still leaves the exhibition field high and dry in terms of security. • • • The producers' association has hired two Ph.D.'s as the nucleus of a factfinding and statistical research department. What are we waiting for — to be slugged by a ton of graph paper? FEBRUARY 19 4 6