The Optical Magic Lantern Journal (May 1894)

The Optical Magic Lantern Journal and Photographic Enlarger. 101 correct, the picture will appear in a minute or so and gradually gain density and detail. After the image is well out, pour off the developer into a separate vessel for use again, and without washing flood the print with the cleansing solution; let it soak for, say, a minute, then throw it away and repeat the dose a couple of times. The picture should now be well washed and fixed in the usual way. The object of the clearing solution is to prevent the precipitation of the iron in the oxalate of potash and iron developer on the film of the paper, and this can only be done by keeping the paper acid whilst washing out the developer | Should the picture have been over-exposed it will flash up quickly under the action of the developer, which should in that case be instantly poured off, and more bromide added to it and the development continued. The image on a correctly exposed print should appear gradually, and should never stop appearing ; and provided that details keep on appearing, they cannot come up too gradually provided they follow each other steadily. (To be continued.} ei Cylinder Box. Wiru reference to some remarks in last issue respecting cases for gas cylinders, Mr. James W. Garbutt, of 10, Edinburgh Grove, Upper Armley, Leeds, sends us the following particu lars of a case he has had in use for some time : past, and which he explains he finds convenient not only asa case, but also admirable for a stand, as the cylinder can be used without being | removed from its case. hinged doors, their hinges being at A and C, both doors or lids being secured by means of a padlock and staple, so that the one lock fastens formed of leather, stuffed with horsehair, are placed at the respective places marked E, so that the cylinder has no shake whatever when closed as at Tig. 1, whilst Fig. 2 shows the box open for use. Mr. Garbutt uses the Manchester that he explains cylinders which turn on from the top and have the regulator aftixed at the side, and the two D and B are two | both doors. Cushions | doors enable it to be used without in any way disturbing its position, for the box or boxes will stand up behind the lantern with perfect safety. For twenty foot cylinders, two are put in the one box with a partition between. oO Editorial Table. WHEELFR'S PrintiInG REGISTER contains cxplicit instructions respecting the production of bromide and developed pictures, and several useful photographic hints. The main purpose, however, is to provide & register wherein particulars may he written under the following’ heads:—No. of negative; subject; sizo of plate; illumination and distance; exposure given ; extra local exposure given to sky, &c.; paper or plate, developed; results or notes for future guidance. This register is cloth bound, and is published by Geo. Wheeler | and Co., 46, King-street West, Manchester, at ls. Proto axnp Lanrern Lensts.—The new catalogue of W. Wray, of North Hill, Highgate, N., is to hand. Rapid rectilmear, wide angle landscape, casket, lantern, and other lenses are included in those manufactured by this firm, which has a world-wide reputation for making everything of the best quality. DeveLorinc Souio Parer.—This new paper, introducod by the Eastman Photo Materials Co. (Ltd.), is printed to a fraction of the depth required for the regular toning process. The following instructions are issued for the guidance of users:—The print ought to show faint detail in all but high lights. Immerse the dry print directly in the developer until print shows all the detail and about half the strength required in a finished print; this will take ten to thirty minutes. Solution No. 1. Hydrochinon 3 ounce (avd.) Sulphite soda xa oe 8 oy is Potassinm bromide.. ee er ” Ammonium bromide ee 2 ys ‘3 Water... . or .. 64 4, (4 gal.) Solution No. 2. Caustic soda } ounce (avd). Water.. a oe .. 16 ,, (1 pint). Solution No, 3. Tannic acid .. 8 grains. Water. . es ai 1 ounce. To Develop ten or twelve prints take No.1 .. we we .. 5 ounces. No.2 .. . 1 ounce. J No.3 .. we 1 dram. The print will, when first put in the developer, fade away to a pale yellow; then will slowly develop up to 4 point showing about as much detail and about one-half the strength asa finished print, remaining yellow, however. If the developer works too fast, dilute with water. As fast as developed throw prints into a solution of acetic acid, three drams per gallon of water. Wash five minutes in frequent changes of running water. then tone in combined bath as usual. No extra fixing. -A little extra care should be exercised in putting Solio intended for development into the printing frames and taking it therefrom. It should be done by subdued daylight. If the prints continue to develop in the toning bath, too much alkali (solution No. 2) has been used in the developer. The prints will appear to strengthen by reason of the change of colour in toning, but they ought not to increase in detail. The exact point to which the | printing is cariied does not seem to make very much