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The photographic news
- Bandzählung
- 27.1883
- Erscheinungsdatum
- 1883
- Sprache
- Englisch
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- F 135
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- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- Hochschule für Grafik und Buchkunst Leipzig
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- SLUB Dresden
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- Public Domain Mark 1.0
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- urn:nbn:de:bsz:14-db-id1780948042-188300004
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- http://digital.slub-dresden.de/id1780948042-18830000
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- oai:de:slub-dresden:db:id-1780948042-18830000
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- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
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- Parlamentsperiode
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- Bandzählung
- No. 1312, October 26, 1883
- Digitalisat
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Zeitschrift
The photographic news
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Band
Band 27.1883
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- Titelblatt Titelblatt I
- Register Index III
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Band
Band 27.1883
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- Titel
- The photographic news
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J 1 7 s t 3 October 26, 1883. | THE PHOTOGRAPHIC NEWS. A very hands of to be— casual reference to the poems, which are in the most educated people, would show the lines distortion they are displaced, and in both cases are more proportionally displaced towards the corners, or, as 1 stated in contradiction to Capt. Abney, the image of 2 । oint seven years after; but any other person may represent the scene or object represented by such painting. The copyright of any painting, drawing, or negative of a photograph made for valuable consideration belongs to the person giving the considera tion. Upon transferring the ownership of painting, the copyright should be transferred or reserved by agreement in writing, or it will cease to exist. Necessity for Registration.—No proprietor of copyright is entitled to the benefit of the Act until registration, and no action can be maintained nor any penalty recovered in respect of any thing done before registration. Registration.—Every copyright must be registered at Stationers’ Hall by the proprietor lodging a signed memorandum of such copyright at the Copyright Office, with a fee of Is. Special care should be taken to describe the work as either “ Painting,” “ Drawing,” or “ Photograph,” adding a short description of the nature and subject of the work, and, whenever practicable, a sketch outline or photograph should be annexed. Assignments should be registered by lodging at the Registry for entry in the Register Book a memorandum signed by the proprietor with a fee of Is. The memorandum for registration of a copyright or assign ment should be in the form printed on the back hereof. Certified Copies of entries can be obtained on payment of a fee of 5s., and such copies are primd facie proof of the matters alleged therein. Applicants not conversant with the mode of registration are recommended to apply personally, or by their London agent, as any error in the statement delivered may invalidate the entry, and no alteration can be made in the Register Book, except by an order of the High Court of Justice or one of the Judges thereof. A stamped and addressed envelope should be enclosed with all written applications requiring an answer. THE EXHIBITION CATALOGUE. Dear Sir,—Referring to the letters of Mr. W. Davies and England Bros, in your issue of last week, I do not see that the misquotation from Tennyson has been rectified. I hope he will not see the hash that has been made of his beautiful lines, which in the revised edition of the catalogue now before me are made to read as follows— I chatter over stony ways, in little sharps and ebbles ; I bubble into eddying ways, I bubble on the pebbles ; I chatter chatter as I flow to join the brimming river; For men may come and men may go, but I go on for ever. I chatter over stony ways, In little sharps and trebles, I bubble into eddying bays, I babble on the pebbles. I chatter, chatter, as I flow, To join the brimming river For men may come and men may go, But I go on for ever. The « sharps and trebles ” are of course suggested by the Dear Sir,—Through your courtesy, I am enabled to reply to Mr. Debenham's letter at once. I leave the matter as it stands, however, remarking that he has taken upon himself to alter my meaning in the quotation he made from my lesson. My displacement of image, as the context shows, was measured from the axis—his is not. I fully agree with the last sentence of his letter. Regarding Mr. Wheeler's correspondence, I shall be glad to investigate the problem he proposes, and have to thank him for pointing out a necessary verbal correction to make as regards distortion.—Yours faithfully, W. de W. Abney. PALL MALL EHHIBITION. Deae Sib,—In your interesting notice of above in to-day’s issue you say : Mr. Charles Andre shows a goodly collec tion of good work, one of his most taking pictures being “ Old Cottages, Yalding ” (156), a wonderful bit of Kentish village scenery; the mullioned windows and quaint door ways of the old-fashioned tenements being treated in most artistic fashion, while the technical details are faultless.” Permit me to say that the frame thus referred to (156), including the “ Old Cottages, Yalding,” is mine. By in serting this correction you will oblige, yours truly, •John G. Horsey. [We congratulate Mr. Horsey, and regret that his name did not appear in the Catalogue opposite this frame of perfect little prints.—Ed. P.N.] lying near the direction of the axis will be less propor tionally displaced than the image of a point lying farther away from the axis, whether the diaphragm is behind the lens or in front of it. As to the cause of distortion, after accusing my diagrams of a contradiction which does not exist, Capt. Abney enquires, “ Assuming his (Mr. Debenham’s) explanation of distortion correct, what kind of distortion would there be if the convex face of the lens faced the diaphragms?” The answer is very simple. The kind of distortion re mains the same, however much its amount might be affected by such a position. Capt. Abney charges me with dogmatic “ expres sion of criticism and wonderful self-assertion.” Pass ing over the question of the good or bad taste of introducing such personalities into a discussion, I would observe that the science of optics is a tolerably exact one, and that the matters under consideration are matters not of opinion, but of fact; within the knowledge, actual or easily attainable, of every scientific man. In matters of opinion a certain diffidence is proper and becoming, which would be out of place when dealing with mathematical facts.—Yours truly, W. E. Debenham. PHOTOGRAPHIC OPTICS. Dear Sir,—Capt. W. de W. Abney, in his reply to my strictures upon two statements that were made in the last of his “ Lessons in Optics,” avoids either defending or abandoning the first referred to, viz., “ that distortion is principally the result of astigmatism ”; and as to the second, “ When the diagram is behind the lens, the image of a point lying near the direction of the axis will be less proportionally displaced than the image of a point lying farther away from the axis; whilst when the diaphragm is in front, the image of the first point would be more pro portionally displaced than that of the latter.” I am sur prised that, having had the oppoitunity of retracting it, he should have thought proper to defend it. The statement is a self-evident absurdity to all who can grasp the whole of a long sentence, and at the same time carry in their minds the diagrams of pin-cushion and barrel-shaped distortion. It may make the matter clearer to put the two diagrams together. The square represents the true projection by a non-distorting lens of a square object; the outer, or pin cushion, represents the form given to such an object by a lens with a diaphragm behind ; and the inner, or barrel- 8hape, the form given by a lens with the diaphragm in front. Now the proper place of the image of each point in the object is a point in the straight lines of the square. By
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