Moving Picture World (Jul - Aug 1918)

70 THE MOVING PICTURE WORLD July 6, 191? 'trigger,'' which is adjustable and may be set to ring the bell at any desired distance from end of reel. The operation is entirely mechanical and, barring possible variation caused by out-of-center reel hubs, or out-of-center film roll caused by some other agency, such as, for instance, a humped-up hub spring, ought to fund ion with at least very reasonable accuracy. I would, however, suggest the making of the component parts, aside from the frame itself, a trifle more substantially. Of course there is nothing in the operation of the device to call for strong parts, but it seems to me the trigger part is unnecessarily light ; also the coil spring is too light. It does not ring the bell loud enough. However I believe the model submitted is mostly hand made and very likely the finally finished, ready-to-be-marketed devlcx would not be properly subject to I criticisms. Hut then 1 would by all moms advise, viz.: so arrange thai the roller si end of arm in magazine will run on Dim track. In fact the arm should, In my Judgment, end in a fork, without rollers. True the arm Is very light but it is nevertheli with the roller not rollerlng, as might happen, that a scratch could result. The scale ol feel would be approximate only and not even that when a large-hub (5-incb hub) n ei is used. This i however, <>f slight importa' holds the magazine arm up out of the way while treading. Altogether, Within IU limitations as a mechanical device, the Indlcati ally well I Shall '■ 'ad to have the opinion of several practical th ing the device as soon as they I One thing makes me par ticularly willing to recommend Its purchase without hesitation and that am quivocal tat. in, ut ,, or money refunded." You cannot very well lose on thai proposition. Address of company supplied It stamped post card is sent for same. An Odd Mixture. L. U Craig, stlseonrl Valley, [owe sends In the following: It is not often thai you hear from a fellow "Ut In tbi who is trying. the li^ht ray problem. I have spent IS years si th< crank, two of thi ' Omaha, then havi \s you no doubt know th. ghl different kinds of lieht raj . of which the Visual has three distinct rays Light n tlon, and be fore tie "•"" or more per second, which is tie Hoi iron, winch looks black to th. off liidil rays. Ion their I of vibration is too low to make tin in \i 1W( I 'I" BOl belli we shall IikIh r..y problem until we i detisers and lenses wliieli will focus all vita uial distance' at one time. 1 in the market a com screen, it was a failure because the lens ground 'or s flat surface, i claim that with s lens around for Aollld help solve llltlell of the difficulty oi securing s perfect sharpness of definition. (You arc badl] brother. The ooncai ras Introduced because the li u'Kiti-: designed for use with just that kind of a screen, or at not corrected Bnely enough. if ti right word rp definition all over the flat held But the cone up other troubles which than the one which it did remedy. The coir • ii had little or no value except with short focal length 1,.TI | i theory in which I think you will bear me out. viz.: If we eoiilel filter out all the light rays but the ultra violet we would have a pel sn illum ination. The Amberlux Lens is a step In that direction. (Are you not putting that backwards" The Amberlux tillers out ultra violet, which is presumed to be injurious to the eyes. I think, from what you say further on that you must mean preiposlte from what you have actually said. — Ed.) In this connection It me say that Inasmuch as the mercury arc rectifier tube gives off a large percentage of ultra violet rays it ought never to be installed in the projection room. The light from the tube, If allowed to flood the projection room, will in time work serious injury to the nervous system of the men therein. To sum up. we will never get the acme ol result until we have a condenser or lens which will filter out all unnecessary rays and focus all rays at the same point. (Some i n aiderable lens. — Ed.) I have perfected a process tor cooling the light ray at the condenser so that when it reaches the aperture it is cool enough to allow of the film being stopped In the' full power of the ray for ten minutes, lias such a thing any commercial value'.' I have given this letter space as a somewhat queer mixture of fact and impossible Ideas. I am not very well up In the various light ray vibrations, but broadly what the brother says on that subject is true, but its utilization in projection is quite another matter. The "foci of different rays at different distances from the lens." of which he speaks, is nothing more or less than chromatic aberration, and li may easily be made to correct that fault. The trouble is that such lenses are too high in price to use for condensers until such time as condenser breakage" can be entirely eliminated. That is what puts the quietus on this particular thing. The question of rectifier tube rays being injurious to health is a serious one indeed, though it has no bearing as applies to actual use of the instrument, but merely as to its location, or the suppression of its tube light, a tinny tics department has long insisted upon, though for other reasons than the one now set up. Paint your rectifier tube black, and iVccji if painted black, is and always has been my advice ii the instrument is in the projection room. As to the ray-cooling process that is easily done, but to date all processes have either been too cumbei or too wasteful in light absorption. If you have something really practical from all view points it should have commercial value. „ Maryland Law. Recently 8 law proposing to govern the licensing of projections was Introduced In the Maryland legislature. The' act as originally presented held a clause requiring on the examining board "one m ician to represent the build office of Haltiiuore city." Tins the exhibitors Insisted be changed to duly licensed to operate motion picture machines." This may be all verj well, but it looks a bit qui d exhibitoi insisting on representation on a board of this kind. It is quite possible they have in mind the preventing of licensing ol any but high grade projectionist! who are expert in their business, but there will be those' indite question that proposition mists, through their representa tive, <'■ Howard Kingston, opposed this change, but conceded it when ii was agreed thai instead ol designating another membei ol the board one licensed moving picture maehl i ratoi It he "one moving picture machine operator, a member of the moving picture operator! union " Now 1 know I shall not be at all popular when 1 say I am opposed to that also. I do not think rl| hi or proper to incorporate into law the proposition thai a board member shall belong to any In my opinion the whole thing, as applies to both projectionist and exhibitor members of i lie ■ examining board, is wrong, both In principle and In practice. I do not blame the p is for insisting on the Insertion of thl clause when they found the exhibitors ted that they themselves be represented on the board, hut 1 do object to the whole proceeding as tending to ill a measure' defeat the verj purpose (or which SUCb ormed Members of the examining board ale state offlCei . and as BUCfa Cai ' without prostitution ol th i themselves in but ■ thing, viz.: The nualilica iion of candidate?! tor license to pro It this is all that the] ha\e in view then why are Maryland exhibitors and proiv anxious aboul having representation on the examining board. Pet onally, I strongly susp. i the exhibitoi wants to get iany men lloi is I possible without too much fussing about competency, while the projectionists want to limit license, and maybe temper the wind to the shorn lamb ' lent In some in i he exhlbi mil hi' -I years I to IN but In that they failed. TI riglnal draft proposed that applicants tor Hi have at lea ti ol experience under a licensed operator, or two y.-ars' experience operating a moving picture machine. This was OUt to "six month i peri. perst i moving pn iuic machine,' which is, if the exhibitors secured the I understand they did, an example of a man handing himself slap on his own face This I that, while ■ works injury to I he ■■ hole Indusl I Injun ' mors than any other one Individual. There has always been mo trouble between Maryland pre and exhibitors over tie examining board make-up. In toy humble opinion this is something worse than a lot oi energy wasted. I believe the projectionists will be willing to keep hands off the make up of the ilbltors win do likewise, and thai both would be gainers If this Wele clone. Take-Up Trouble. Edward ; nkfort, Maine-, has trouble with his take-up, which in describes as folio Am an Int ider c,f the department, and have obtained much valuable Information therefrom From your descriptions theaters I find thai although 1 am now operating in a small ii still our equipment is not so far behind the una: though w, an •'"< tantly trying to Improve, Have a Power's Six, which has been working very nicely, but all e>r a sudden when machlnt is in operation the crank will go around two, three or maybe four times alright, then once or twice It will go very hard, varying that way It runs alright without the film, or with the film allow.il fo drop free Upon the floor. Why should it be different when lower r<<l is in action? That Is rather hard to say. When It is running hard test the film between the lower sprocket and the fire-valve of tin lower magazine. It is pulled very tight — much tighter than when machine runs easy—