Volltext Seite (XML)
THE PHOTOGRAPHIC NEWS. Vol. XXVII. No. 1278.—March 2, 1883. CONTENTS. PAOE PACE 129 129 131 132 133 133 134 135 135 136 131 138 139 140 141 142 142 143 143 144 Patent Intelligence Twelve Elementary Lessons on Silver Printing The Adaptation of Machinery to Photography. By G. II. Babcock Review Bicycles and Tricycles as a Means of Locomotion to Photo graphers. By C. E. Arthur A Quick Method of Masking Out the Sky in Landscape Nega tives with a Candle. By A. Harrison Hill Correspondence Proceedings of Societies Talk in the Studio To Correspondents Mr. W. E. Debenham suggested a cam arrangement for lifting the rod at the end of the stroke, and it was also suggested that by giving the forked end or stirrup a little play on its shank, and arranging a feeling piece or finger of silver wire to drag on the edges of the plate, no incon venience would result from the use of glass varying much in thickness. forthcoming upon this now popular theme. There is no doubt but that gelatine plates have stimulated lantern work very greatly, perhaps not to the same extent as some other branches of the art, but probably in a direction where real advancement was necessary, viz., in the quality of the work produced. If we are to take the last show at the South London Society in January as typical of this advance (and there are no two opinions as to the pre-eminence of that Society in all that appertains to lantern matters), we do not hesi tate to say that the last exhibit brought out some of the best lantern work that has ever been shown. True, there were some poor slides, but this would always occur in the absence of a sort of censorship of the slides submitted for exhibition ; and we may here remark that we regard with approval the suggestion which was made at that society’s last meeting, which was that a sub-committee or small jury of censors should pass the slides which are sent in for exhibition, the jury to sit an hour or two before the performance commences. No would-be exhibitor need feel offended i f, out of twenty of his slides sent in to the jury, only ten or a dozen were projected on to the screen ; on the contrary, before another lantern show came round, he might probably thank the jury for having guarded his reputation by withholding such slides as in their judgment were not up to the fair standard of quality. As was justly remarked by one member, himself a first-rate slide maker, the exhibition of a slide is a most critical test; unlike a gallery of photographs, where there i is plenty to distract the visitors, an exhibition of a slide : takes place before several hundreds of pairs of eyes; i every one’s vision and thought are concentrated upon the > object on the screen ; if there is a defect or a shortcoming, it is noted by somebody, just as surely as when a first-class , slide makes its appearance, it never fails to “ bring down LANTERN SLIDES. First Article. During the past few weeks, at more than one of our metropolitan societies, the subject which heads this article has been brought forward, somewhat tardily, it may be— for we should ourselves have been glad to have seen the mattgr started at the beginning of the dull season—but not yet too late for a vast amount of information to be The skeleton or frame-like top, A A, is slightly rebated, so as to steady the plate ; while the long block, D, can slide freely to and fro under the plate in a pair of grooves, one of which is shown at G G, the handle, F, serving to move the block, D. It must be understood that the block D is so long as to project beyond the frame-work at each side, and each projecting end carries a forked or stirruped screw, 0, E, and these stirrups carry a glass rod shown in section at C. The mode of using the apparatus now becomes obvious. The stirrups having been set to the right height, by means of the adjusting screws, and the table levelled, a plate is placed in the rebate, and a measured portion of emulsion is poured on, near the middle. The glass rod is now placed in the stirrups, and the sliding piece D is moved to and fro once or twice : stops being inserted in the slot, in order to pre vent the rod travelling so far as to cause the emulsion to now over the edges of the plate. An apparatus of this character should be of especial value to the collotype 1 ', as it would certainly prove valuable in coating his printing plates, also as a means of readily coating gelatine emulsion plates without soiling the backs; this being an important point when exposure is to be made through the glass inorder to produce a reversed negative. At the meeting of the Photographic Society referred to, AN ARRANGEMENT FOR SPREADING EMULSION ON THE GLASS PLATE. At the last meeting of the Photographic Society, Mr. Charles Whiting exhibited a very simple and ingenious apparatus for spreading emulsion on the glass plate, and the arrangement is so simple that any person possessed of a very moderate amount of mechanical skill may construct it himself. The frame-work of the apparatus may be regarded as a kind of skeleton table without a top, and one side is repre sented diagrammetrically by the subjoined diagram. B and B represent two of a set of four levelling screws. A D An Arrangement for Spreading Emulsion on the Glass Plate Lantern Slides At Home.—Mr. A. Cowan’s Laboratory in Porchester Terrace Photography as a Help to Painting By M. R. Burton The Reduction of Over-Exposed Silver Prints. By Arnold Spiller Photo-Lithography and Photo-Zincography. By Major J. Waterhouse, B.S.C Notes on Photography. By E. Howard Farmer Sulphocyanide of Ammonium a Solvent of Gelatine. By H. L. T. The Removal of Fixed Glass Stoppers Notes