FIGS. 1 AND 2.—THE DEMENY PROJECTION APPARATUS.
- 1. Arranged for use without electricity or gas.
- 2. Arrangement for stopping the strip of film.
Strips of sensitized films from sixty to ninety feet in length were not available at this time, and it was necessary to employ some makeshift. Images were taken from the chronophotographic apparatus upon a strip four or five yards in length, and were printed as positives upon a glass disk sensitized by chloride of silver, and it was by means of this disk that the projection was made. The number of images was limited to forty or fifty, according to the subject, but the advent of the long strips of sensitized film induced the inventor to so modify the apparatus as to be able to take images in long series and for projecting them. The apparatus of M. Demeny, which we show in our [engraving], employs strips of any length, but at present the longest that have been used are one hundred and fifteen feet. This gives about one thousand images of the dimensions adopted by the inventor, one and one half by one and three quarter inches. This wide surface of the image has an immense advantage, since, with the electric light, it permits of throwing the moving pictures on a screen sixteen feet high.
For a small screen the oxyhydrogen light will be sufficient. The lantern is provided with an ordinary condenser, in front of which is placed a water tank to absorb a portion of the heat. At the opposite end of the table stands the chronophotographic projector which carries the film wound around its bobbins. The lantern is so regulated that the luminous rays will fall exactly upon the aperture as the image passes behind the objective, O.
FIG. 3.—INTERIOR VIEW OF M. DEMENY’S REVERSIBLE
PROJECTION APPARATUS.