The Optical Magic Lantern Journal (December 1890)

The Optical Magic Lantern J ournal and Photographic Enlarger. 03 thorough control at the jets themselves. The ordinary household tap, although effective in its way, does not place in the hands of the operator that amount of nicety of adjustment which is requisite. We give a cut of a tap which is capable of extremely | fine adjustment. This tap, which is the invention of Messrs. Noakes, of Greenwich, can be Fi of the jet cocks, in lieu “| of the usual bends on which the rubber tubing is attached. justment, that when the tap is quite open it requires six or seven revolutions of the milled head to completely close it. It will thus be evident that a great range of difference of pressure may be adjusted. In the case of mixed jets two taps are required, whilst with blow-through jets, one on the oxygen side only is requisite. ‘or Flashes on Lantern Topics, By BULL'S-EYE. THE Edinburgh Photographic Society’s International Exhibition was opened just fourteen years after their first one, on November 14, and in the same place—the Royal Scottish Academy National Galleries—and is a great success. There are at least two thousand exhibits, which range in interest from the earliest Talbotype (a view of Laycock Abbey), the earliest Daguerrotypes and cameras, down to the latest triumphs in apparatus and photographs by the latest and every known process, which in many instances are of rare excellence. There are not many varieties of lanterns exhibited—indeed the collection is most meagre—but among them must be noted as screwed into the back : ; own to be examined and reported upon. So fine is the ad One thing [ must note, as it relates to permanency. The posters for the exhibition were neat good examples of printing, with a rich brown ink; but, alas ! the first : stormy showers exhibited the printers’ ink running like damp water-colour. Verd. sap. In the coming lantern season there will crop up the usual number of complaints of lack of light in the lamp ; and allthe old and some of the new causes were suggested in the case of a friend of mine, who was quite up to managing his Sciopticon, but who failed to get a decent light, and has had to fall back upon a mutual friend, from whom he borrowed, and left his After trying everything the oil was changed, and the light proved perfect. Here the oil which would not light up was taken from a new barrel of the best for household purposes, and for the ordinary lamps did its purpose, but was not suited for the lantern. In the same connection one of the managers of our extensive vil refineries gave his advice, which was to the effect never to use over-rectified oil, the whole body being taken out of it ; and what was wanted for enlarging lantern purposes was a good solid flame—as he expressed it; one with a body in it ; and the commoner Scotch oils were the : best for the purpose. 10: . Shenstone’'s Enlarging Apparatus. IN last issue mention was made in “ Notes” that Mr. Shenstone, of Colchester, had patented an enlarging i lantern and stand. We now give our readers a short description of the apparatus. Fig. 1 shows the lamp ‘ and camera On a stand, through which slides a rod, contributed by local men the fine series of Hume's Cantalever lanterns; Turnbull’s varied exhibit, with a specialty in the shape of a walking stick, containing a light strong tripod stand ; Buncle'’s combined enlarging camera and lantern ; Baird's neat At Home enlarging lantern and camera. George Mason & Co. have a fine and varied exhibit of all that relates to the belongings of photography, their catalogue being a decent-sized volume; and others too numerous to particularise. large, but there is a good collection and arrangement of slides, among the exhibitors of which may be mentioned Mr. H. Blanc, the president of the society ; Messrs. Wilson & Co., and Valentine & Son ; Messrs. Brigham. Pike, Ellison, Webling, Dore, Austin, Meares, and others equally meritorious. The prizes offered are a gold medal for the best picture, irrespective of size, subject, or process, besides one silver and one bronze medal, in twenty separate classes ; and in addition three silver and three bronze medals for apparatus, materials, or processes, at the discretion of the judges. There is nota, | | and the resulting pictures were very fine. Fic, 1. carrying at its end the easel, upon which is fastened the material to receive the enlargement. This rod is ;marked off in inches and parts, showing at a glance the distance between the easel and lens. The lantern (Fig. 2) contains two lamps, either of which may, by the movement of a rod from the outside, be placed in the centre of the lantern, the ordinary oil-lamp is used for focussing, whilst the exposure is made Fy “with magnesium wire, which is ignited a " by the spirit lamp shown, The front | \ — of the lantern is occutie. % pied by a sheet of opal glass, which equalises the lizht. In front of the opal is placed ithe frame (Fig. 3) for holding the negative , We have seen the apparatus in use. fal Fic, 3,