Motography (1912)

64 MOTOGRAPHY Vol. VIII, No. 2. the operator, when using alternating current, to keep his projection out of synchronism with the current phases. If with 60 cycle current the operator should project at about 15 pictures per second, or at about 12 pictures per second, the recurrent combination of the flicker of the shutter with the flicker of the alternating arc will cause waves of light and shadow to be seen upon the screen. With 25 cycle current and with 1,009,494. pictures projected at about 12^ pictures per second, the result is the same. Further, the 25 cycle arc is so flickery that it is difficult to handle satisfactorily in projection. The use of the vapor rectifier gives substantially a direct current for the arc, avoiding the troubles due to the alternating arc. In the matter of economy, projection of the same intensity with the "rectifier" current will require much less current than with the unrectified alternating current. The circuits and devices of this patent are illustrated in the accompanying drawings. No. 1,009,673. Reel for Moving Picture Films. Carl James Lang, Olean, N. Y. 1,009,673. By way of explanation (and perhaps apolgy) for inflicting another patent upon a suffering public, Mr. Lang recites one of the troubles which we all know eats up our leaders and tails. He says : This invention relates to reels, and especially to reels for moving picture films, the object being to provide a reel upon which the film may be quickly put in place and having improved means for attaching the end of the film to the reel without damage to the film. The film reels ordinarily used on moving picture machines, consist of a pair of circular sheet metal plates with a hub at the center, the hub being provided with a spring catch under which the end of the film is engaged. In attaching the film to the hub it is customary to fold the end of the film several times and then insert the folded end under the catch. This has the defect that the folds cause the film to break or crack, and in time the end of the film will become broken off and since said films are used repeatedly the result is that sooner or later part of the matter to be exhibited is broken off, by the repeated shortening of the film. To avoid this defect I provide a reel of improved construction. In the drawings, Fig. 1 is a side elevation of the reel. Fig. 2 is a section through the hub, at a right angle to its axis. The rim of the hub has slots 11 extending across the same, in a direction parallel to the axis, and is also provided with rows of teeth 12, properly shaped and located to engage in the sprocket holes along the side edges of an ordinary film. The side plates are fastened to the hub by means of screws 13 extending through said side plates and into the webs 9 of the hub. Said side plates also have slots 14 extending inwardly from the openings 7, and said slots 14, when the parts are assembled, register with the slots 11 in the hub. The slots 11 are for the purpose of receiving the free end of the film which is to be wound on the reel. Said end may be entered sidewise through a slot 14 and into one of the slots 11, and the reel being then rotated the teeth 12 engage in the holes in the film, and so the film is wound on the hub, between the side plates of the reel. When the reel is placed in the machine and the film unwound, it will, when the end of the film is reached, lift or disengage from the teeth 12, and the end will slip out of the slot 11, without breaking or damaging the same. Therefore in winding or unwinding the film there is no necessity for folding or bending the end of the same, in a manner to cause breakage thereof, and another film can be conveniently placed on the reel, or the same film rewound thereon. What I claim as new, is: — 1. A reel for films or the like, having a recessed and slotted side plate, and a hollow hub attached thereto, and having a slot registering with the slot in the side plate for the reception of the end of the film when applied laterally. 2. A reel for films or the like, comprising side disks and a hub therebetween, the hub having a slot to receive the end of the film, and one of the side plates having an opening which communicates with the end of the slot in the hub, whereby the end of the film can be inserted laterally into the slot, through said opening. No. 1,009,897. Projection Apparatus for Announcement Slides. Nathaniel W. Dexter and Warren B. Mather, Los Angeles, Calif., assignors to United States Electrographic Company, a corporation of Nevada. The invention provides for the projection of announcement slides, and for the making of announcement slides, more particularly providing for means whereby announcement slides may be projected upon the screen and viewed by an audience during the progress of making. This result gives a novelty in projection in cases where the slide might have been prepared before its projection, or gives a great facility in speed of making and projecting in the case of projecting news slides, there being no delay between the writing of the news and the projection of it upon the screen. The distinguishing feature of the invention is the provision of a glass, or other transparent plate, placed in the beam of light projected and in such a position with relation to the apparatus that it can be easily