The Optical Magic Lantern Journal (April 1892)

48 what flatter than it is to appear when finished; in other words, the highest lights must have a silver deposit in them, and not be clear glass. After having fixed the slide in hypo in the usual way, wash thoroughly under a tap for a few minutes, the elimination of the hypo being of importance to insure success in the toning operations. Make up the following three stock solutions, which can be done in a few minutes, and keep indefinitely :— No. 1. Uranium nitrate ............00. I part Water arise sioesdeedientace cases I0o parts Filter in case the solution is not clear; this is generally unnecessary. No. 2. Ferricyanide potassium ...... 1 part Water scsi wcatavsseesssteceveave 100 parts No. 2. ‘ Ferrichloride.............0cc0ee0I part Water secsvieieiacasegnceecess? 10 parts Now you have everything necessary for toning, and proceed as follows :— a. CHOCOLATE-BRrown Tones. Take ten parts of No. 1 and one part of No. 2, and permit the slide to remain in this solution until the desired tone has been reached. In order to control the procedure of the operation, examine the slide in transmitted light every ten or fifteen seconds. The whole operation rarely lasts a minute. After the desired colour has been produced in the slide, wash the same for a few minutes, and then place it upon the rack to dry. 4. Brown Tones. Take five parts of No. 1 and one part of No. 2, and proceed as in a. c. ReppisH-Brown Tones, Take equal parts of Nos. 1 and 2, and proceed as in a. @. Rep Tongs. Take one part of No.1 and two parts of No. 2, and proceed as in a. In order to keep the high lights clear in this operation, a few drops of glacial acetic acid solutions added to the toning solution may be used to advantage. I myself never use any though, not deeming it necessary if the toning operation is carefully performed. é. GREENISH-BLUE Tongs. Take equal parts of Nos. 1 and 2, and tone the slide until it is of a very dark colour, and very dense. Rinse for three or four minutes, and then plunge into a solution of one part of No. 3 and. five parts of water, in which solution the slide is allowed to remain for at least five minutes. It is then washed and dried, drying out in a greenish-blue. (Zo be continued.) ry schQ The Optioal Magio Lantern Journal and Photographio Enlarger. Editorial Table. TYLAR’S MONOCULAR AND BINOCULAR LANTERNESCOPE.— Mr. Tylar, of Birmingham, explains to us that although it was announced in our columns fourteen months ago that he intended shortly to introduce a binocular lanternescope on the lines mentioned in our issue of Jan. 1, 1891, he had been so busy with other subjects that he had only just been able to introduce them. He has also made an improved style of single lanternescope, in which a reflector is attached to the instrument, and this also forms the stand. This arrangement enables one to use it without having to pointit tothe light; no special : lighting. arrangements are thus required. There are no projections from the sides. There isa slide adjustment of great range for focussing, and the pictures appear with great amplification. The binocular form is very similar to the monocular, but is, of course, made sufficiently large to enable two prismatic lenses to be used. These are adjustable both for the width of the eyes and for focus. These two classes of instruments are made either with or without stands. Price List.—The Thornton-Pickard time -and instantaneous shutter has lately had several improvements added to it, which it is now claimed “is as perfect as anything can be.” We observe from their catalogue that this shutter is fitted behind the lens in their new Ruby Camera. These shutters are made in a variety of styles, for time or instantaneous exposures, and for hand and stereoscopic work. Special lenses, exposure meters, and other photographic specialities are to be found in this catalogue. NATURAL PHENOMENON IN IcE.—A_lanternslide, which is both interesting and curious, has been received from Messrs. Martin and Co., 4 and 3, Park Villas, New Southgate, N. It appears that this remarkable group of crystals was produced at Christmas, 1891, in a Join. by Sin. dish of New River water, quite spontaneously, no process or artificial aid having been resorted to to induce the formation. A film of ice was observed floating somewhat loosely