Exhibitors Herald and Moving Picture World (Apr-Jun 1930)

53 le 7, 19 SO Exh i bitors He raid W orld VALUABLE INFORMATION ROM Robert F. Smith, member of Local No. 219, Minneapolis, has come interesting letter. Incidentally, out all the thousands of readers of this artment, he is to date the first to d in really valuable data on the relai of film temperature at the aperture h in-front-of-the-lens shutters and hi the new rear shutters. On such a stion as this I had expected at least thousand of you would respond. My ipliments to Minneapolis and to ther Smith, who says : Dear Mr. Richardson : I attended S M P E convention in Toronto last as the guest of Chauncey L. Greene through him was afforded the pleasof meeting you. I note in the deJtment of April 12th, your request for umunications from projectionists coniing the degree of heat reduction and possibilities of film ignition where i rear shutter is used. In September, 1928, we installed, at i Mew Grand theatre, Minneapolis, i Model M Motiograph projectors lipped with the new cylindrical shut. Sound by Western Electric. Light i:ce Peerless high intensity reflector '>. We are today using approximately Inty-five amperes at the arc — -the : ers-that-be having neglected to supus with either ammeters or voltJers, that figure is based upon the nstat settings — and a recent pyroric test, taken between the shutter ' film, indicated 450 degrees of heat ;hat point, as versus something over "0 degrees on the opposite, or arc i, of the shutter. Inasmuch qs the Tmeter was not calibrated beyond 1 0 degrees, the actual temperature ;he latter position could only be estiied. In all events the manufacturer’s in to more than a 50 per cent reduc( of heat is clearly substantiated in i test. For some time after the introduction found we were provided with a third f iograph for silent subjects. This r ector, however, had the old type fit shutter. We were thus placed in excellent position to experiment with i matter of damage to film by heat. ■ tactically new two-reel comedy, after showing through the third projector, ; removed from the takeup magazine 1 1 condition that could be described ni by a student of geometric figures. 1 general outline of the film on the e' was that of a four-leaf clover. The itself was buckled, warped and so othat it was painful to touch. I never ,(ld have believed it possible for film attain that degree of heat without siting. This comedy was rewound and r-d in the storage cabinet. Two °'s later, when it was taken out to be u the film was still hotter by two or h'e times than a reel just removed Hoffmonn iToons p™ No matter what rheostat you have been using all these years, if it isn’t a Perfection there’s been lacking that superb quality which distinguishes it above competition. Sold by all branches of the National Theatre Supply Co., Sam Kaplan, New York, Continental Theatre Accessories, and by your dealer. HOFFMANN & SOONS 387 First Avenue New York City Manufacturing Division Contracting Electrical Engineers — Moving Picture Electrical Specialists THE ONLY UNION MADE RHEOSTATS C I N E P H OR » .. LENSES « « PRODUCT OF PRECISION PLUS » » Precision — almost unbelievable — guarantees perfection in grinding Cinephor Lenses. Tested by Light Ray Interference, one of the most critical methods known to science, surface variations to within millionths of an inch are noted. As a product of America’s Leading Optical Institution, Cinephor Lenses are unequalled in critical definition, flatness of field, illumination and maximum contrast between black and white. Write for complete literature.