The Optical Magic Lantern Journal (April 1892)

46 Tae Optioal Magio Lantern Journal and Photographio Hularger. | ‘ ‘ and if not, filter through rag into a bottle. This | well amalgamated. When sufficiently cooled, this will keep for any length of time. I will just say | small lump may be boiled in a solution (consist—for soldering steel add a little powdered sal | ing of vitriol, 1 part; water, 8 parts), which will _ ammonia; this gives greater strength to the joint... SPELTER AND SILVER SOLDER. These are generally employed for what is| termed hard soldering or brazing. It is necessary to use a high temperature for this work (as shown in the table mentioned below), and it will be requisite to gauge the heat at your disposal. When one has the means of making up a good coke fire, fierce enough to render a piece of brass 6in. square a good cherry heat, one has nothing to fear, and a little practice is all that is required to enable the user to perform any soldering he may require. I give a table of four qualities, together with their fusing points, so that the reader may decide which will best answer his particular requirements; but it is well to remember that the better the quality the greater the durability, although it is perhaps better at first to use one at low temperature, which fuses easily, than those which require experience in working. Taro SOLvDERs. Fine Silver. Copper. Spelter. Melting Point. t. Tard...... 16 parls. 4 parts, _ 1866 Fahr. 2. Medium 15; 4 » ¥ part. 1843, 3. Easy... 14) yy 4» 2 813 y 4. Veryeasy I1I4 ,, oy, 24 4, 1802, 5. Spelter... aan _ _ 773,» Let us, by way of illustration, make up a small quantity of No. 3, whichis well recommended : Take fine silver, 28 grains ; copper, 8 grains ; Make a hole about the size of spelter 4 grains. a sixpence in a piece of charcoal and into it place the silver and copper, together with a piece of borax about the size of a pea; then, with the blowpipe and gas-flame melt together, after which add the spelter, continuing the blowing until it is speedily free it from the borax. It must now be flattened by hammering, and should occasionally be annealed by making red-hot on the charcoal. Fux. In order to make a flux for hard soldering, rub a piece of lump borax up with water on a clean slate until it is of the consistency of thick cream; this will forma flux for either of the solders mentioned in the table. ; There is one more word of advice upon this subject, and that advice, which is all important, is —cleanliness throughout is imperative. 70: Instantaneous Dissolving. By H. M. UnpbeERHILL. In his interesting paper on “ Dissolving Views ”’ I think that Mr. Baker is right in saying that the public like these “effects.” The severe purist, with his grey photographs, is, after all, in danger of becoming somewhat wearisome, and such an effect, for example, as the gradual change from summer into spring, produced by slowly “ dissolving ’’ one slide into another, 1s very pretty. But I think that when one view is “ dissolved ” into something quite different by lowering one light and turning up the other in the usual way, the effect of one picture being, as it were, “seen through” another, is particularly unpleasant. The dissolving of a pair of oil lanterns with their fan is something quite different. There the pictures really “dissolve’—break up, and reappear; and you never see both pictures at once. Even if with lime-light you turn the dissolving