The Optical Magic Lantern Journal (June 1891)

The Optical.Magic Lantern Journal and Photographic Enlarger. 119 further supply of gas ta enter from the battle. This double pumping action gocs on, thus maintaining an even outlet pressure until the pressure in the bottle is reduced to 4 of an atmosphere. Hand-Cameras for Obtaining Slides for the Lantern. March Ist, 189C. (Fallowfield) No. 1 lah"... ... (Mawson & Son) v5, May Ist, yo Quadrane” ... CW. H. Humphries & Co.) ,, June Ist, ,, yo Eclipse we (fo Fe Shew & Codi. ce yy July Isty oy 4 A“ Eureka’ 0. (WLW. Rouch & Co.) .. 4, Auge Tet, w Oo Key”... (Platinotype Co.) ... v4, Sept. Ist, oy » 8 “Optimus” (Perken, Son & Rayment) ,, Oct. sty yy yo? "Phe Griffin — (Griffin & Sons, Limited) 1, Nov. Ist, 55 » $ “Phe Swindea-Earp"' Patent ae aie 47 Dees Ist oe rn 9 ' Collins" (C. G. Collins) we yy) Feb. Ist, 1891, y 10 Kodak" (Eastman Co.) -. oy, Mar. Ist, oye v1)“ Guinea” (Walter Griffith) ... » April Ist. 5, yy 12“ Vanneck " (Watson & Sons). weg) May Ist, on No. 13.—“ CHADWICK’S.” Mr. J. W. Criapvwick, of Manchester, has certain practical ideas of his own as to what a haudcamera should do, and he has arranged the camera bearing his name in accordance with his ideas. » [tis for quarter plates, is light and compact, and is intended for taking pictures from about the same height as the view is seen in Nature, and _for this reason it is held close under the chin asin Fig. r. In order to ascertain the angle of view, three small pins are arranged on the top of the camera front (Fig. 2). By sighting along the pins, first with the right eye and then with the left, this is at once ascertained. In point of size, the camera is about the same as that of a cigar box. The dlivision containing the lens is capable of being racked in or out for focussing. The milled rig. 3, head by which this is done is of a decided novel style. Itis provided with a heart-shaped aperture which forms a pointer, which travels round a circular ivory disc, upon this may be marked the various distances to suit the lens in use. Asa ground glass is supplied with the camera, it ts recommended that each user prepare his own scale as follows :—“ First. pin a newspaper on a wall and walk away about. three strides, put in diaphragm, and by means of the focussing button adjust the focus —i.c., make the printing of the newspaper sharp on the ground-glass, and mark the index with a straight line in black ink. Call this No.1 Register, and associate it with the nearest distance one would ever wish to use ; next focus something on the opposite side of the road, and mark the index again, this time with red ink. Call this No. 2, associating it with the distance across an average street. Now take some more distant object, say in the garden if you like, and mark the index once more, this time with black ink again ; this is our No. 3 Register, and these three marks are all that will be required.” ‘fhe shutter, which is of the Kershaw pattern, works in front of the Icns, and is attached to a hinged front ; when time exposures are required, this front is left open \ Fig. 3 Fig. 2 (Fig. 3), and when the camera is mounted upona light stand, the exposure can then be given in the ordinary manner by a cap. The sensitive plates are contained in Barnett’s Patent Plate holders (an American invention). These holders contain one plate each. and being made of compressed cardboard are very rigid, whilst possessing the property of lightness. As they are very thin, several can be carried without inconvenience in one’s pocket. Six of these carriers are included with each outfit. ‘0: Experiences in India with the Ether-Oxygen Light. By CoL. T. DEANE (SIMLA). Mx. C. Goopwin Norron has (in the journal for March) recorded some useful facts regarding the safety and utility of the ether-oxygen light. My experiences with this light are precisely similar to his. I have used the best apparatus that can be secured, and find the light most unreliable. On several occasions it has answered perfectly, and on others, without any apparent reason, and with the adoption of all the precautions referred to by Mr. Norton, explosions have occurred which are sufficient to deter anyone from using it with any degree of confidence at a public exhibition. Mr. Ives, who is, I believe, the inventor of the saturator, recommends the use of benzoline instead of ether. ‘(his I have also tried, but with less favourable results. Iam now about to try Mr. Scott’s Warm Air Saturator, but must confess that past experience