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February 1937
INTERNATIONAL PROJECTIONIST
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OJECTIGNISII
With Which is Combined PROJECTION ENGINEERING ^ Edited by James J. Finn
Volume 12
/
FEBRUARY 1937 /
Number 2
Index and Monthly Chat 5
Types of Shutters and Their Effect Upon Projection, II . . 7 A. C. SCHROEDER
The Present Position of Color
Cinematography 12
D. A. Spencer, Ph. D.
Commutators: A Little Care
Saves Big Repair Bills 16
L. E. Miller
Constructional Changes in Some Sound System Components . . 17 Leroy Chadbourne
W.E. Amplifier Tube Chart . . 18 W.E. Rectifier Tube Chart .... 21
Nebraska Forces Room Ventilation After Arc Exhaust Tests 22
The Editorial Page
Eye-Strain: A Definite Occupational Hazard for Motion Picture Projectionists 24
Charles R. Underhill, Jr.
News of the Month 25
Notes From the Supply Field . . 26
Sharon, Pa., Manpower and Examination Laws Serve as Model for Craft Generally . . 28
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. Contents copyrighted 1937 bv James J. Finn Publishing Corp. International Projectionist is not responsible for personal opinions appearing in signed articles in its columns.
MONTHLY CHAT
HEREIN is the second in the series of amplifier and rectifier tube characteristics, together with socket connections— this time applying to Western Electric (Erpi) theatre sound picture equipments. This, together with the RCA tube characteristics published in I. P. for Dec, 1936, should service a majority of the craft in this particulai respect.
Save these tube charts, the compilation of which reflects no little effort. Keep them handy in the projection room for constant ready reference. Duplicates of the RCA chart, which may have been mislain, will be supplied providing request is accompanied by three cents postage. Requests from organization officials for sufficient charts for entire memberships will be honored on the same basis.
Publication of these charts reflect a definite need expressed by many craft members, illustrating once more the responsiveness of I. P. to craft needs and the good that can be accomplished by closer contact between I. P. and the field — through correspondence. Don't hesitate to request I. P. service on any matter of this character. Incidentally, these tube charts are an exclusive feature of LP., having been published nowhere else.
IP. is sneeringly referred to in some • quarters as a "crusading sheet" — which description is all right with us. There is so much that is rotten in this end of the business, including disdain if not actual contempt of the allegedly low-brow projectionist, that I. P. gets a great kick of straightening out a few of the vocal high-brows.
Next month, in addition to much other good stuff, we shall uncover the results of a little research into the functioning (if any) of the so-called new double-reel standard, including a few choice statistics about exchange operation and other activities incidental to a reel length that has strangely shrunk from an irreducible minimum of 1750 feet to 1000 feet and less. This task really galls us, because we shall have to use that time-worn phrase, "We .told you so".
THE second instalment of the color cinematography article herein, to appear next month, will take the wraps off the current color film situation. As forecast in informed quarters, the real worry of the color promoters is the projection process. One color system, that of lenticular film, requires extensive overhauling of the projection plant, particularly anent optics. I. P. disapproves strongly of all this pulling and hauling of existing apparatus; it holds that a new system designed expressly for color projection is badly needed. More anon on this, after the "experts" have had their say. The fact that straight black-and-white projection is wholly unsatisfactory in about 60% of American theatres seems not to deter even slightly the onward rush of color films. We shall see.