The Optical Magic Lantern Journal (July 1893)

The Optical Magic Lantern Journal and Photographic Enlarger. 99 ment of the ordinary limelight lantern, Care should be taken that the supply tubes be sufficiently large, and that if a regulator is used on the oxygen bottle, it must be set to a pressure sufficiently high to supply the whole of the burners. If, in the room where the portraits are to be taken there is no house gas attachment, then must a cylinder of hydrogen be at hand. When lighting up, the same precautions as to warming the lime, &c., must be taken as in lantern work. As the naked light would cast abrupt shadows, it is necessary to temper it | by the interposition of a sheet of tracing paper or cloth, and the jets should be enclosed in some Way so as to keep the lighting more under control. A box of about 2ft.6in. each way, and covered with calico, which has been soaked in tungstate of soda, will answer admirably. With reference to the relative positions of the sitter and the light, the following diagram, it was pointed out, would make the matter clear, A camera, B sitter, C light, D_ reflector. x a < \ COO KOSS ert ‘ NON uy awe wr NN [Aten 2 so edesy “<"@ yaa yar Eearesy The light should be placed about 4 ft. distant, and about 6 ft. from the floor, provision being also made for raising or lowering the illuminant by meaus of a rope and pulley. An ordinary lantern screcn stand will answer for a support. However, given the light with means of adjusting, an artist will be able tomake the most of it. A suitable apparatus, it was explained, need not exceed five pounds in cost. With a rapid plate, averaging the exposures at 8 to 12 seconds, 40 feet of oxygen should suffice for fifty sittings. When a series of portraits are to be taken, the light may be kept burning, but if there is not constant work the oxygen can be turned off, and the hydrogen lowered when the apparatus will be ready for usc at any moment. —-:0: —— Saturators (Luckett’s), Mr. EB. Lucker, the organising agent of the Surrey Band of Hope, sends us particulars of a saturator he has been in the habit of using almost every second day. It has three brass tubes 12 in. long, and 2 in. in diameter, each packed with flannel, the tubes are connected in the style shown, so that the oxygen has to travel through 3 feet of material charged with | benzoline. The inlet is at A on tube No. 1, | whilst at the one end tubes 1 and 2 are connected, and at the other end 2 and 3 are similarly connected, so that when the gas comes out of B 3, it has travelled through each stuffed tube. _ The method of heating has already been described in our issue of September 1892. Mr. Luckett states that he has used this particular apparatus for several years, and considers it quite safe. It has been ascertained that only one-half of the oxygen necessary for a blowthrough jet is required for this apparatus with mixed jet, and that the light is vastly superior. Hand-Cameras for obtaining Slides for the Lantern. “* Facile” -March Ist,'90 . No.15 ‘‘Repeater” .. Aug. lat,’91 No.1‘Giah” ... ..May Ist, ,, | ,, 16 “Marvel” -. Sept. 1st, ,, » 2**Quadrant"’.. June Ist, ,, » 17Talmer™ —.. Oct. Ist, ,, » 8Kclipse” .. July Ist, ,, » 18‘ The Omnigraph " » 4‘Eureka” .. Aug. Ist, ,, Noy. let, ,, » o Key” .. ,. Sept. Ist, ,, » 19 “ Ubique” -May 1st,’92 » 6“ Optimus” .. Oct. Ist, ,, . ,, 20‘ Daylight Kodak ” » 7‘ The Grifin’' Nov. Ist, , June lst, ,, » 8‘‘The Swinden” Dec. Ist, ,, », 21 “ The Radial”... July Ist, ,, » 9*Collins” .. Feb. Ist,'91 —_,, 22‘ The Surprise " Aug. Ist, ,, » 10‘ Kodak"? .. Mar. Ist, ,, » 23 Perfect” .. Sept.1st, ,, yll “Guinea” .. April 1st, » 24‘ Frena”.. .. Oct. Ist, ,, » 12‘ Vanneck” .. May = Ist, , » 25 '*Metcor”.. .. May Ist,’93 » 13 “Chadwick” .. June Ist, ,, » 26“ Archer”... .. June lst, ,, » 14 “Bonanza” .. July Ist,’91 :0:——— Hand Cameras, &c. No. 27. “Uno.” THERE appears at present to be a run on handcameras costing about a dozen shillings or so, and, as is usual, a supply is produced to satisfy the demand. One cannot, of course, expect a 12s. camera to be as good in all respects as onc: costing a few pounds, but some of the former upon the market at the present time are wonderful at the price. The Uno Camera Company, 46, Southamptonbuildings, W.C., have introduced a magazine camera termed the ‘“‘ Uno;” they are made at various prices, according to the workmanship, but the principle in each is the same.