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The photographic news
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- 27.1883
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- Bandzählung
- No. 1273, January 26, 1883
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Band 27.1883
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- Titelblatt Titelblatt I
- Register Index III
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Band 27.1883
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THE PHOTOGRAPHIC NEWS, Voi. XXVII. No. 1273.—January 26, 1883. ral ies, - The in CONTENTS. itly RY 3k. Y- •or eat of PAGE A Phosphorescent Plate for Sensitometric Investigations 49 On the Coating of Plates with Gelatine Emulsion 49 Messrs. Morgan and Kidd’s Improvements in the Manufacture of Gelatino-Bromide Paper, 60 By-the-Bye.—About some Studios 51 Notes on Photography. By E. Howard Farmer 52 Photo-Lithography and Photo-Zincography. By Major J. Waterhouse, B.S.C 53 Photo-Micrography, By T. 0. White 55 PAGE 56 58 58 59 59 60 G2 63 64 Notes Patent Intelligence Twelve Elementary Lessons on Silver Printing A Phosphorescent Tablet as a Standard Light. By A. Spiller Review Correspondence Proceedings of Societies Talk in the Studio To Correspondents • on meter a phosphorescent surface, but, as our readers may lnAx in .1... .c xry 1 5 7. * c , the apertures. ou of he do be rill It will be in the memory of our readers, that about two years ago the members of the Photographic Club appointed a committee to consider the sensitometric question. After making several experiments, Mr. Warnerke devised an instrument, which was accepted as a reliable sensitometer. The construction of the apparatus may briefly be described as follows:—To a level glass plate are cemented, with a solu- standard light for the same period. The film under exami nation is finally treated with a standard developer, the highest grade appearing being compared with other films. A gelatine bromide film of thirty times the sensitiveness of wet plate would register about No. 20 with the sensitometer ; that is to say, the light which passes through the W oodbury- typic gelatine film where it is twenty times thicker than at the thinnest part would be just sufficient to make an impression. doubt, when Mr. Brightman proclaimed at the Bristol Photographic Society that “ sulphide of calcium is not reliable as a standard light for comparative experiments with the sensitometer, from the fact that an increase in least one who does no band-coating at all. Some time ago we described Mr. Swan’s coating machine in these columns. It is peculiar in this, that the plates are coated face upwards. So far as we know, it is the only machine in which this is the case. Briefly, Mr. Swan’s tion of albumen, layers of thin paper, varying from one to twenty-five. A Spence’s metal cast of the paper tablet thus prepared is used for making Woodburytypic impres sions, by pouring a standard mixture of gelatine solution and lamp-black on the cast, and then pressing the excess out with a plate. The gelatine film, thus prepared, varying in opacity from one to twenty-five, is attached to a glass plate. For a standard light a phosphorescent makers who were in the habit of using either of the above described sensitometers for testing the sensitiveness of their plates felt somewhat inclined to discard the instrument, on the ground that it was unreliable. Our correspondent of this week is of opinion that the instrument is reliable as regards varying temperature. 100 ng .•ill all st, of a- ven ) » is ON THE COATING OF PLATES WITH GELATINE EMULSION. Second Article. a iso lis ed it. we ise of sal bo res y. , a la- tal :o- ith to nt in ish io- A PHOSPHORESCENT PLATE FOR SENSITO METRIC INVESTIGATIONS. . is applied to the coating of plates in his factory, where work Messrs. Mucklow and Spurge also use with their sensito- is carried on on a very large scale. Ata _ hngk i Ju.aco, Jus, „„ Ju. udu.g —y The greater part of the floor space of a large room is taken know, in place of Warnerke’s gelatine film an apparatus is up by an oblong table with a level slate top. Along one used not unlike a gem camera, in which the lenses are side of this levelling table sit a row of girls, each of whom replaced by diaphragms of different diameters. Their has opposite her one of Eastman’s machines. apparatus is used after the manner of the former, the film & lor lei o ely ow te, Is, iy; od is arrangement is as follows. A continuous band of cloth is kept passing through a trough of warm emulsion. The band is guided by rollers, so that it passes under the level of this trough, and is caused to bear upon the upper surface of plates which are kept moving on another continuous band under the trough. The machine which is probably most in use is Eastman’s. We are able, by the kindness of Mr. Samuel Fry, to describe the manner in which this machine • • . , . — -— • , — 1 These are exceedingly simple, both in construction and under examination being placed opposite the diaphragms action. The machine consists in an india-rubber roller, as in a camera, the luminous surface is of course located next I about two feet long and a couple of inches in diameter, the apertures. This is so fitted that it may revolve on a horizontal axis, We have briefly described these apparatus to show the its lower surface dipping in a trough of emulsion, which important role played by a phosphorescent tablet in sensito- is surrounded by a water jacket to keep up the tempera meters, and thus our readers can well understend the ture. The rotary motion is rapid, apparently about as importance attached to Mr. Spiller’s communication. No I quick as that given to a turning lathe for working hard In our last article on the above subject, we expressed our intention of describing what we know of machine plate coating. As stated before, machine-coating is by no means Iso commonly resorted to as hand-coating, the reason being we believe, that most have found it difficult to give a sufficiently thick film when using machinery. We know, however, of several extensive manufacturers who do at in situ, and by preserving it from the deleterious effects of least a great part of their coating by machinery, and at moisture, acid vapours, &c. To use the apparatus, the 1 * ha J h—3 " sensitive film to be tested is placed behind the prepared gelatine, the phosphorescent surface is first made luminous by burning one inch of magnesium ribbon close to it, and after a minute’s duration the plate is exposed to the The communication by Mr. Arnold Spiller, which we wun ine sensiomever, num ue sau ouav au uuicaou il insert this week, will be received with great interest by temperature causes an increased luminosity in the previously those of our readers who are in the habit of using a phos- excited surface,” several photographers and gelatine plate phorescent tablet for sensitometric investigations. 1 ’ ** ' ” ’
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