The Moving picture world (November 1926-December 1926)

Record Details:

Something wrong or inaccurate about this page? Let us Know!

Thanks for helping us continually improve the quality of the Lantern search engine for all of our users! We have millions of scanned pages, so user reports are incredibly helpful for us to identify places where we can improve and update the metadata.

Please describe the issue below, and click "Submit" to send your comments to our team! If you'd prefer, you can also send us an email to mhdl@commarts.wisc.edu with your comments.




We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.

Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.

58 MOVING PICTURE WORLD November 6, 1926 Bluehook School Answers Nos* 526 and 527 Note : — This "School" is designed to arouse interest in the study of those many problems which constantly arise in motion picture projection, AND to cause men to really study the Bluebook and assimilate the vast amount of knowledge contained within its covers. Question No. 526 — Name the various things which cause the resistance of a copper circuit to increase or decrease. W. C. Budge, Springfield Gardens ; C. H. Hanover, Burlington, la. ; Charles C. Curie, Chattanooga, Tenn. ; S. F. Cooley, Manchester, N. H. ; W. C. Doe, "Bill" Doe and John Doe, Chicago, 111. ; E. Fergodo, Livermore, Cal. ; Al Lehman Glenside (no state given, I think it is New York) ; Frank Dudiak, Fairmont, W. Va. ; Allan Gengenbcck. New Orleans, La. ; T. H. Bankerton, Wentsville, Mo. ; G R. Hahn, Memphis, Tenn. ; Gilbert Atkindon Cleveland, Ohio, and T. R. Guimond, Mobile, Ala., all made good on this one. On the whole, I think Brother Curie has put it best. He replies thus : "Resistance increases as (a) length of circuit is increased, or (b) length of circuit 4s decreased; (c) as temperature is increased above normal ; (d) as composition of wires is changed to an alloy having lower conductivity. "Resistance decreases as any one or more of before named factors are reversed, except that this only holds good as to (c) if temperature be above normal. "Note. — The difference in conductivity of various metals makes the analogy of water to current the niore complete, since it corresponds to roughness or smoothness of pipe walls. Much might be said in explanation of the foregoing, but it would all have the same meaning. I think Brother Richardson has done a very good job in the Bluebook and can see no room for improvement." Question No. 527 — Taking the resistance of copper as one (1), what is the relative resistance of aluminum, of Fero Nickel (rheostat wire), of Climax resistance wire, of nichrome, of Advance resistance wire, of silver and of steel? All the before named, except Bankerton, made good on this, which only required an examination of page 65 of the Bluebook. These questions are asked merely for the sake of completeness of the "course," and to draw your attention to all data contained in the Bluebook. All the replies to this one are, of course, essentially the same. Brother E'udge saj's : "Taking the resistance of copper as one (1), the resistance of aluminum is l..">. that on Ferro Nickel 17, that of Climax resistance wire 50, that of Nichiome OG, that of Advance resistance wire 28, that of silver 1 (the same as copper) and that of soft steel 8." Don't get discouraged by the comparatively uninteresting lot of questions we have just now. We will get through them and into more interesting stuff before long. By the way, I notice at the end of Brother Curie's answer to 527 this note : "While not attempting to improve upon our Editor's work, there is a point or two I wish to bring out. If we are to be absolutely correct we must remember that it is annealed copper that has its resistance represented by one (1). The relative resistance of hard drawn copper is 1.022; also the resistance of pure annealed silver is 0.92.'>. This is only to emphasize the point that there is a difference in metals, and «»• must know precisely what the metal is liefore being too certain about their relative resistance" Correct, Brother Curie, but in our l)usi ness we deal only with commercial copper. With silver we deal not at all. It is, of course, understood that even commuercial copper, which is presumed to be always the same as to its composition, really varies slightly, hence its resistance will also vary slightl}-, or may do so. You were quite right to raise the point. It shows that you really understand the matter. However, such differences have no especial interest for the projectionist, though the student may pursue them as far as he will. What's that? The projectionist should be a student? Correct, Brother Curie, but just now there are so many things he so sadly needs to study that I'm not stressing these finer points. Organizations Act Splendidly THE terrible storm which swept over Florida wrecked and put temporarily out of business every theatre in Miami. This left all members of the Miami local without means of earning a living ; also many of them suffered the loss of their homes and all their possessions. This is the Mechau Projector, recently described in Moving Picture World. A is the lamphouse. B the hood contaitiing the reflector by which the light beam is projected forward to the screen. C the projection lens, D the curved surface which forms the aperture over which the film passes on its way from upper magazine J to iower magazine K. E is the lens foscusing screw, beside which is the flaming arrangement which operates by rotating the sprockets. F is the driving motor. G the driving wheel. H the crank. I the weight which drives the carbon feeding mechaism. The thing immediately over the lamphouse is the stereopticon attachment mirror which projects the slide image forward into the projection lens in front of it, just back of hood B. Immediately upon learning the conditions, the I. A. T. S. E. & M. P. M. O., by order of President Canavan, sent a check for $1,000 to the local ; it also recommended to all its affiliated locals that such contribution as each local felt able to make should be sent immediately to Local 545 at Miami. This is a splendid action. It is real brotherhood. It cannot be too highly commended. We hope the results will prove sufficient to tide the Miami men over the crisis, and that in due time the awful disaster will be only a memory. The sympathy of all projectionists is with you of Miami, and I am more than pleased to know that the sympathy .is; taking tangible, practical form Projectionist Turns Tipster HH. HEDSTROM, prijectionist, Orpheum Theatre, Twin Falls, Idaho, • says ; "Friend Richardson : — I feel that I may call you that after eight years of very practical use of your (leave the "y" off that last word — Ed.) department, even though you have never heard from me. "Here is a little tip which may to some extent repay the many I have had from the department. Regarding Brother John Griffith's framing stunt, it is all right, only a bit too complicated. I've been threading my Simplex projectors in frame without a slip lor eight years in this way : Be certain the intermittent is on the 'lock.' Hold the film so that your thumb-nail is on a frame line and engage the film with the sprocket teeth so that you can still see two sprocket holes between your thumb and the sprocket. In this it is assumed the projectionist faces the screen, looking at the emulsion side of the film, and not, as I have seen some, doing a swan's neck in order to see the front side of the sprocket. "This will work every time, on old or new Simplex projectors, single or double bearing intermittent, providing the movement be on the 'lock' while threading. ■'.'\nd while I'm at it, I want to thank yourself and the brother contributors to the department, and to add one more to the list of boosters for your very excellent Handbook, which I, of course, have." Friend Hedstrom adds an explanation of not having written before, but acknowledges it is not a very good one. In that I agree with him. However, better late than never. I fired an engine out of Shoshone in 1883. W'e were then building the Oregon Shorl Line on which line my dad was the first passenger engineer. Many thanks for your tip. .\m not sure I quite understand you, but believe you mean that as you look at the sprocket there will be two holes between your thumb and the top of the sprocket. S'pose some of you chaps try this out and report your findings. Come again. The latch-string is on the outside of the door always.