The Optical Magic Lantern Journal (March 1890)

The Optical Magic Lantern Journal and Photographic Enlarger. 77 I would suggest that until this point is settled beyond dispute, Scott’s saturator should be used with pumice tubes. M.Pumphrey, of Birmingham, makes them of a substantial kind, and it must bea heavy shock indeed of explosive flame that would force its way through one of his tubes. Or, in lieu of pumice tubes, you might use Oakley and Beard’s safety jet, made after a model given by me in Zhe British Fournal of Photography. This jet has the additional merit of being very sz/en¢ under high cylinder pressure, as the mixing chamber is oval in form without any corners, and in conjunction with the pumice chamber above tends (like the air chamber in a forcing pump) to destroy jerking movements and produce a continuous flow. With Mr. Scott’s nipple of one-fourteenth of an inch aperture attached to one of the afore-mentioned jets, and connected with his apparatus, I have obtained a Stronger light than I ever got before without noise ; but I should hesitate at present to make an exact comparison between benzoline and coal gas in that particular, and I am also of opinion that much may be done with apertures of a smaller size (such as onetwentieth ofan inch), provided the pressure be sufficient to spread the flame over the whole face of the lime. In Messrs. Griffith Morris’ circular, which I receive every month from their address at Manesty-lane, Liverpool, I see gasoline spoken of as sold in original cases containing two cans of four and a-half gallons each, at Is. §d. per gallon, cases included. The railway companies, however, refuse to carry it except at what they term their “ ton rate,” so that by the time it reaches Sunderland, which is the nearest large town to me, the price has risen to 2s. 6d. a gallon. Even then it is much cheaper than “ White’s anesthetic methylated ether of °717,” which is sold here at 2s. 3d. per pound. In concluding this article, I must, in the name of all lecturers who use the limelight, thank Mr. Scott for this last and most important addition to our means of illustrating what we have to say, and of teaching by the eye as well as by the ear. T. FREDERICK HARDWICH. I would venture to suggest a caution in using Scott’s saturator. The.tap leading to the bag, or cylinder, should be kept closely shut until-the supply of oxygen gas is turned on, as I notice a tendency to condensation of vapour in the O tube, and a consequent spirting of a few drops of liquid gasoline the wrong way: when this precaution is neglected. 30 Editorial Table. No.1 of The Amateur Photographer Prize Pictures contains an essay on “ Photography as a Recreation,” and is illustrated by the Woodbury type process from photographs by Mr. Alex. Keighley, together with descriptions of same. It is nicely got up, and the printing both of the pictures and letterpress is unusually fine. THE catalogue of Messrs. D. Noakes and Son, of Greenwich, is before us. It states that this firm make a speciality of supplying, not only lanterns and slides, but also a competent manipulator, and even a lecturer. Particulars are given of their apparatus, including an intermediate gas regulator, which they claim prevents noise when compressed gases are used. : The Facile. ON another page will be found an advertisement of this useful and complete hand camera. The accompanying FILLING with Cuts represent New PLATES’ the internal arrange ments so completely that the mode of working of the various parts will at once. be apparent. A dozen plates placed in sheaths are inserted in the upper cham Fic. l. ber (Fig. 1) and the lid closed. Another chamber, identical in all respects with the first, is situated beneath it. These boxes (Fig. 2) are so connected with a rack and pinion that by slightly turning the milled head, the upper box is moved forwards and the lower backwards. There being a | slot in the base dividing these two chambers, } each plate will in turn } slide into grooves prof vided in the lower box, Fic. 2. where it stands ready for exposure. The exposure is effected by pressing a lever at the lower part of the camera, and the shutter (Fig. 3) is such that the re) act of exposing resets it. The exposed plates are removed from the lower chamber by a_ similar arrangement, as Fig. 1. A finder is provided, and the lenses supplied are of excellent defining power. It would be a difficult matter to conceive of a more concise way to | carry, change, and expose plates. This camera has been found excellent for taking negatives with a view to their reproduction as lantern slides. { EXPOSED fF PLATES “FACILE” Fic. 3. 30: THE best style for glass painting is undoubtedly the florid, which consists in keeping all the colours bright. The powerful artificial light which passes through the glass renders it imperative that all objects depicted upon it should be exaggerated in tone. In glass slides the amateur is advised not to use greenish blues or greenish yellows.— A, N. Rintoul,