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The photographic news
- Bandzählung
- 29.1885
- Erscheinungsdatum
- 1885
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- Englisch
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- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1396, June 5, 1885
- Digitalisat
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Zeitschrift
The photographic news
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Band
Band 29.1885
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- Register Index III
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Band
Band 29.1885
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June 5, 1885.J THE PHOTOGRAPHIC NEWS. 359 H A— Developing pan. allow the and with • Continued from page 332. taken to determine the uniformity or the intensity of light emitted from the standard candle. In view of the differences in the lamps, each one is marked I with a special number, which is the separate test, as was shown on the millimetre scale, when it was originally tried, and is to be used when the lamp is put into the main circuit of battery M, in the manner previously described. The electrical standard of light thus obtained is far more con stant and reliable than that obtained from the standard candle, in that all variation of the flame or the uncertainties of the wick standard for use in the laboratory, or even for use in gas-works, and is an improvement which has long been sought for. F—A common split weight of, say, 4 lbs., that rests on the bottom ledge, G, of pendulum bar. H—A tall head-rest, of any make. are avoided. The galvanometer employed is of the ordinary pattern, having an estimated resistance of about 500 ohms. As soon as any blackening occurs on the interior of the globe, cent. Much credit is due to Mr. Edison and his assistant in work ing out the practical details of the apparatus, and the simplicity I' delicacy by which the resistance is employed to control the rent of the variable battery is especially commendable. Io delicate is the balance that the resistance of a quarter of inch of the resistance wire can be read on the galvano- ter. Che application of the light in testing the sensitiveness of otographic dry plates may be described as follows :—A sensi- e dry plate is placed in contact with a Woodbury carbon reen, such as is used in a Warnerke sensitometer, in a plate- ilder, and the latter is set into a groove at one end of the sting box, the slide protecting the plate from all light, then >ing withdrawn, as shown in the engraving. The electric mp is then placed so as to be opposite the centre of the screen, id 24 inches therefrom. The switch putting the battery M i circuit is now turned on, and the light emanating from the imp is allowed to act upon the screen for twenty seconds ; it I instantly stopped by turning off the switch. The sensitive plate is next removed from the plate-holder and ilaced in a developing solution of a given strength for five ninutes, and it is then taken out, washed, and immersed in a ixing bath of hyposulphite of soda until the bromide of silver ilm, unacted upon by the light, is dissolved out. It is again washed, and when dry, is laid film side down upon a piece of white paper. The highest number on the finished negative which can be seen represents the sensitiveness of the plate, and by means of comparative tests the relative sensitiveness of different plates is thus easily determined. A sensitive plate showing a reading of 25 will be regarded as having an extreme degree of sensitiveness; and other things ing 14 would be considered very slow, but excellent for copying or for ordinary landscape work. Nearly 200 tests have been very successfully made with the lamp, and it forms a valuable addition to the photographic laboratory. In addition to its application to photography, the light may be used for many other purposes, such as comparative photometric tests with other kinds of illuminants. It forms a ready and convenient to find. But if you examine the photograph carefully, I you’ll find that my left foot is too large, and the little । finger of my right hand has got an awkward crook in it, and that fold in the trousers is very ugly, and somehow my head’s on one side, and one eye seems larger than the say, 14 by 16 size. C—The arms, welded to pendulum, with screw-holes that allow the top to be fastened firmly in its place. D—A round rod of iron, flattened at one end to go into the jaws of ear-clips in head-rest, to hold it to its place and make a home for the pendulum. E—The pendulum, made of bar iron, flat, wide enough to allow for hole being drilled to pan on arm clutched in ear-piece of head-rest, the hole being bored large enough to allow it — pendulum to pass two inches or more on the rod, rm’ ■ sufficient play to prevent binding. The vain sitter.—" Oh! I think it’s very bad, and none of my friends like it. They think it does not do me jus tice.” Jhe snub-nosed sitter.—“ Flease take me in profile ; that suits me best.” The sitter with the washed-out eyes and straw-coloured eye brows.—" I don’t like the portrait at all. Surely my eyes should come out better than that.” Ihe unreasonable sitter.—“Yes; I’ve had a couple of sittings, but you do not mind, of course, giving me another without extra charge? ” The dissatisfied sitter.—“ Oh, I’ve not the slightest fault The short-legqedsitter.—“ I always take better standing.” ' The squinting sitter.—“ Looking up—straight towards the spectator, you know—is the best view of my face.” The fashionable lady.—“ The portrait is not a good one, because the dress doesn’t come out as well as I expected.” AN ELECTRICAL STANDARD FOR MEASURING LIGHT* The mode of testing the candle power of each lamp is to first set the hinged pointed foot arbitrarily at some number on the millimetre scale, then to turn on the switch of battery M, and gradually slide the wheeled collar from the extreme right hand end of rod No. 1 to the left, until enough resistance is cut out to make the intensity of the light from the lamp equal the light of a standard candle, and at the same time to see that the read ing of the galvanometer is zero. The average of a large number of photometric readings is . . . . The lamp, when employed in making the photographic tests, (stretching out his legs a yard and I is used but a few seconds at a time, and it is estimated one lamp tin" hin honde Ao in his trousers’ | will, on this account, be good for several thousand tests before the variation of the light will amount to more than one per A ROCKING STAND FOR THE DEVELOPING DISH. L. W. Felt, of Chicago, sends to the Photographic Times a de-' scription of a rocking table which he uses in his dark-room, for holding his dishes while developing. The rocking motion keeps the developing solution flowing over the plate evenly, and allows attention by the photographer to other duties. a—levuaupus pu n.1 1, 1.1 a ... being equal, such as freedom from fog in the film, will be ex- B—Top, made of wood, larg g y p u cellently adapted for taking instantaneous pictures. One show- other. Still, the photograph’s a very nice one, and, as I said just now, I’m not complaining in the least. The plain sitter.—" I’ve brought a photograph of Mary Anderson for the pose I wish to be taken in. I m con sidered very like Miss Anderson.” . As svon as any uiackelilig oucurz uu ue iuVLII • 6101 The self-opinionated sitter (after throwing himself into a 1 or even before it, which is due to the gradual destruction ot Ie sprawling attitude all over the chair).—“There, that’s I ^bon film from long use, the lamp is removed and a new lamp something like how I want to be taken—easy and natu- I substituted. .... .... ral, don’t you know. None of your artificial fancy poses' for me. Doesn’t this (stretching out his legs a yard a-half apart, and thrusting his hands deep in his trousers’ pockets) look better than holding the eternal book.” Nearly every mother.—" My children never give any trouble in being photographed.”
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