The Optical Magic Lantern Journal (July 1890)

14 Tho Optiosl Magio Lantern Journal and Photographic Enlarger. mounts, folding cameras, their new plate-lifters. which prevent the fingers from becoming contaminated by the various developing and other solutions ; lamps, lanterns, and other selections from their extensive stock. G. Smith’s (Sciopticon Co.) exhibits consisted of | a handsome gas or lamp shade and screen containing , photo-transparencies, also lanterns of the Sciopticon | type. Lane sheets of celluloid were hanging on the stand occupied by England and Co. Prominent upon the table of Pearson and Denham was their justly-celebrated lantern-slide reducing | camera, which is susceptible of varied movements. The Circumbra, Standard, and other cameras were also shown. John Lewis and Co. had several clockwork rockers at work, which run for nearly an hour with one winding ; also examples of kallitype printing, which is five | or six times as sensitive as ordinary albumenised paper. The “Scotia Camera” was shown by James | Thomson & Co. This isa light field camera capable of various adjustments, and is a most complete instrument. The display of Newton & Co. consisted of oil, oxyhydrogen and electric light optical lanterns, prominent among them being the Scientist’s lantern, des‘ cribed on p. 85 of the last volume of this journal. Several fine lantern transparencies of microscopic objects by Mr. T. E. Freshwater were alsoon the stand occupied by this firm. J. Swift and Son had a large closed case, containing their widely known lenses and cameras, also two new forms of hand cameras—the Paragon and the Memorandum. ; Isochromatic plates, specimen negatives and transparencies were exhibited by B. J. Edwards and Co. These were arranged on the sides of a square so as to be viewed by transmitted light, several electric lights being placed behind. W. Watson and Son hada general display, including ; optical lanterns, cameras, lenses, rockers, dishes, stands, and a variety of other apparatus. Henry Crouch’s (Limited) exhibit included the Presto hand camera. which carries two dozen plates ; len<es, Acmé shutters, and tripods. A closed case of general photographic apparatus was occupied by Morley and Cooper. An ingenious German hand camera was shown by | Otto Scholzig. i R. and J Beck had a novel method of showing their aluminium lens mounts. <A pair of scales contained | on one side two brass-mounted lenses. and on the; other side five aluminium-mounted lerses and an odd flange, which just balanced. Sands and Hunter, in addition to general apparatus, exhibited several instantaneous pictures of athletic | sports exposed with their shutter. W. Wray's case contained lenses of all styles. and also some large pictures taken at the French [xhibition with their lenses. A tastefully-arranged display of photographic sets was to be found upon the szall of the London Stereoscopic Company. The well-known Dallmeyer lenses were to be seen in a prominent position. ' take twelve seconds F. W. Hart exhibited four different varieties of flash lamps. several of which were connected with an automatic discharger, capable of working a hundred. lamps simultaneously ; also some soft and wellilluminated “flash lamp” pictures; a convenient air-tight magnesium wire reservoir, from which any desired length in inches could be drawn; also a new bamboo stand, which can be used for several purposes, such as holding an arrangement of flash lamps, . a photographic back-ground, or a magic lantern screen, special provision being made for inclining the screen when the lantern is tilted, and also for stretching it. The stand for a 16ft. screen can be packed in an ordinary cricketing bag. Developing tents, enlarging lanterns, and a novel ; panoramic camera, from the French Exhibition, were exhibited by Geo. Houghton and Son. Robert Abraham's display occupied a large portion of the side of one of the halls, and included various kinds and forms of cameras, optical lanterns, stands, burnishers, washers, sets, lenses, mounters, and various other apparatus. The working of the Victor and the Ideal hand-cameras were demonstrated, and a number of pictures taken with these two cameras were exhibited. Gotz’s patent camera, turn-tables and iron printing paper. and Suter's aplanatic lenses and specimen prints . were included in the exhibit of J. R. Gotz. H. Clarkson showed cases for keeping limes, and also his gas regulator. Walter Tyler had a display of lanterns in all sizes and forms, jets, condensers, slides, lenses, saturators. The glare from the polished brass work of the: numerous lantern fronts conduced to the attractiveness of this. exhibit. Fallowfield's Facile handcamera was also shown in this stand. Marion and Co.'s stand, though very large, was well-stocked with mounts, easels, cameras, stands. and general apparatus, including a folding lamp invented by Mr. Cade, and a combination stereoscope and camera (by Ransom). Various apparatus connected with optical lanterns were also to be found here. 10% Editorial Table. | AN ingenious instrument for calcul.ting exposures has been devised by Mr. Altred Watkins, of Hereford. It consists of a brass cylinder, upon which rotate four rings, each provided with a pointer and a scale. At one end of the cylinder is a supply ot sensitive paper, and at the other a cap connected with a chain to act as a pendulum for counting seconds. The chain having been set swinging, the end ccntaining the sensitive paper is exposed to light, and the duration of time noted that it takes to acquire the density of a coloured mark immediately alongside. This we will assume to The actinic force of the light is.