Suche löschen...
The photographic news
- Bandzählung
- 24.1880
- Erscheinungsdatum
- 1880
- Sprache
- Englisch
- Signatur
- F 135
- Vorlage
- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- SLUB Dresden
- Lizenz-/Rechtehinweis
- Public Domain Mark 1.0
- URN
- urn:nbn:de:bsz:14-db-id1780948042-188000001
- PURL
- http://digital.slub-dresden.de/id1780948042-18800000
- OAI-Identifier
- oai:de:slub-dresden:db:id-1780948042-18800000
- Sammlungen
- Fotografie
- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
- Bemerkung
- Exemplar unvollständig: Seite 1-82 in der Vorlage nicht vorhanden
- Strukturtyp
- Band
- Parlamentsperiode
- -
- Wahlperiode
- -
- Bandzählung
- No. 1140, July 9, 1880
- Digitalisat
- SLUB Dresden
- Strukturtyp
- Ausgabe
- Parlamentsperiode
- -
- Wahlperiode
- -
-
Zeitschrift
The photographic news
-
Band
Band 24.1880
-
- Ausgabe Ausgabe I
- Ausgabe Ausgabe I
- Ausgabe Ausgabe I
- Ausgabe Ausgabe I
- Ausgabe Ausgabe I
- Ausgabe Ausgabe I
- Ausgabe Ausgabe 83
- Ausgabe Ausgabe 85
- Ausgabe Ausgabe 97
- Ausgabe Ausgabe 109
- Ausgabe Ausgabe 121
- Ausgabe Ausgabe 133
- Ausgabe Ausgabe 145
- Ausgabe Ausgabe 157
- Ausgabe Ausgabe 169
- Ausgabe Ausgabe 181
- Ausgabe Ausgabe 193
- Ausgabe Ausgabe 205
- Ausgabe Ausgabe 217
- Ausgabe Ausgabe 229
- Ausgabe Ausgabe 241
- Ausgabe Ausgabe 253
- Ausgabe Ausgabe 265
- Ausgabe Ausgabe 277
- Ausgabe Ausgabe 289
- Ausgabe Ausgabe 301
- Ausgabe Ausgabe 313
- Ausgabe Ausgabe 325
- Ausgabe Ausgabe 337
- Ausgabe Ausgabe 349
- Ausgabe Ausgabe 361
- Ausgabe Ausgabe 373
- Ausgabe Ausgabe 385
- Ausgabe Ausgabe 397
- Ausgabe Ausgabe 409
- Ausgabe Ausgabe 421
- Ausgabe Ausgabe 433
- Ausgabe Ausgabe 445
- Ausgabe Ausgabe 457
- Ausgabe Ausgabe 469
- Ausgabe Ausgabe 481
- Ausgabe Ausgabe 493
- Ausgabe Ausgabe 505
- Ausgabe Ausgabe 517
- Ausgabe Ausgabe 529
- Ausgabe Ausgabe 541
- Ausgabe Ausgabe 553
- Ausgabe Ausgabe 565
- Ausgabe Ausgabe 577
- Ausgabe Ausgabe 589
- Ausgabe Ausgabe 601
- Ausgabe Ausgabe 613
- Ausgabe Ausgabe 625
- Register Index 631
-
Band
Band 24.1880
-
- Titel
- The photographic news
- Autor
- Links
- Downloads
- Einzelseite als Bild herunterladen (JPG)
-
Volltext Seite (XML)
July 9, 1880. [ THE PHOTOGRAPHIC NEWS. 329 angles in the grooves, and the arms can go no further. The shake or jar is taken by the shutter, the spring point not being rigi i enough to communicate the vibration to the camera. When the current ceases to pass, the spring point rises into the Other part of the groove, and the arms pass past each other so as to close the lens. Thus the exposure is just as long or as shod as electric contact is made. A pneumatic arrangement could easily be substituted for the electro-magnet. NOTE ON THE OXY-HYDROGEN LIGHT. BY REV. T. F. HARDWICK.* The discussion at your last meeting will, I fear, go far towards neutralizing the effect of my paper. Nevertheless the fact re mains that 1 have used the oxyhydrogen lime-light for years, and in rooms crammed with people, without the slighest accident of any kind. May I ask Hr. Cadett whether he is in the habit of washing the oxygen gas in a solution of carbonate of soda before collecting it in the bag ? I myself always do so very carefully, and the result is that my oxygen bag, although an old one, is quite free from the white powder alluded to by Mr.Bolas and other speakers. Two purifiers should be used, with a quarter of a pound of com mon washing soda to the pint of water in each, the end of the delivery pipe being plugged in the second, and afterwards drilled with five or six small holes of about one-tenth of an inch in diameter. After ten or twelve lectures, change the solution and put in fresh soda. The quantity of chlorine in the oxygen will be less if you prepare the gas at a low temperature, and avoid heating the retort red hot at the close of the operation. I have never seen the white powder complained of, but the description of it reads suspiciously like the powdery pyroxyline made by acting on cotton with weak nitric acid. Is it possible that an oxide of nitrogen or of chlorine may come off with the oxygen in small quantities, and, if not eliminated, may form some unstable combination with the calico lining of the bag ? I merely throw out this as a suggestion, not being able in any other way to account for Mr. Cadett’s explosion. It appears that he was using a safety-jet, with one bag only, and that the oxygen passed through water before reaching the burner. Would it not be worth while to collect some of this white powder, found in old oxygen bags, and hand it over to Mr. Spiller for analysis ? I have a very pleasant recollection of Mr. Spiller’s name some twenty-five years ago, in the earlier days of photo graphy, and I am sure he would not object to the trouble. It gave me much pleasure to see Mr. Newton on the list of speakers, although I could not agree with some of his remarks. Curiously enough, I gave my first lecture twelve years ago with a lantern of his construction, and I saw at once that I had a valuable instrument for enabling me to get a hold on my people. Such being the case, I had nothing to do but to learn how to use it, and to take those precautions which common sense suggested. Amongst other things, I always appoint a friend to have charge of the gas-bags, and to see that no one comes near to touch them during the lecture. Latterly I have departed somewhat from the mode of working which Mr. Newton advises in his remarks, and, instead of loading the bags heavily and contracting the orifice of the jet, have en larged the orifice and lessened the weight on the bags. This must necessarily facilitate the passage of the gases in the right direction, and lessen the risk of explosion. The burner which I laid on the table at your last meeting does not admit of any coal-gas passing back into the wrong bag, for by unscrewing the nozzle you will see that a second nipple inside the first is pierced with eight very minute holes, through which the oxygen enters the mixing chamber. I lay very little stress, however, on this precaution, and have no more fear of a diffusion of the two gases whilst I am lecturing than I should have of shooting myself if I were to take up a gun. Some other explanation must be sought of the strange, and, to me, inexplicable accidents referred to by Mr. Newton. The remark at the close of my paper on the paucity of lantern slides had reference to the class of subjects likely to be required for moral and religious teaching. I wrote to Mr. F. York, of Notting Hill, upon this subject some time since, and he applied to Messrs. Virtue for permission to copy their valuable collection of Scripture engravings, but I am sorry to say they were not willing. • Communicated to the Photographic iSociety, I hope they will reconsider the subject, and see that it would be to their advantage to do so. I must thank Mr. York for his zeal in bringing out so complete a list of hymns, more than three hundred in all, as the singing of hymns is one of the great at tractions in these lectures. I do not despair of seeiug the lantern more generally used than it is at present, if the name can be changed, and the causes of failure clearly explained. Thirty years ago the best photographers were never sure of getting a picture, but by patience and perseverance the weak points were discovered one by one, and what a different state of things pre vails now ! It will be the same with the optical lantern if those who have time and talent will take it up. ROYAL CORNWALL POLYTECHNIC SOCIETY. The following are the regulations for competition, &c., for medals and prizes offered in connection with the Exhibition, to be opened on Tuesday, August 31st, so far as photography is concerned : Photography,—In all cases state whether the work is profes sional or amateur, and name process of production. All works sent for competition must have been executed within eighteen months of the date of this exhibition. Carte-de-visite portraits are excluded from exhibition except when illustrating some special process or novelty. Professional Photographers.—Medals are offered by' the Society for meritorious productions in the following subjects;—(1) For landscapes ; (2) for portraits; (3) for portraits untouched ; (4) for composition pictures ; (5) for instantaneous pictures ; (6) for dry plate pictures; (7) for pictures by improved pro cesses ; (8) for enlargements. Amateurs.— Medals are offered for meritorious productions in this department. Photographic Appliances.—Medals are offered for improved apparatus and appliances, including magic lantern work. All exhibits in this department must be accompanied by a written explanation of their specialties. Information respecting the Society and the Exhibition and forms to be filled up by the exhibitors, may be obtained from the Secretary, Edward Kitto, Polytechnic Hall, Falmouth. Information respecting the Art Union may be obtained from the Honorary Secretary, R. J. Bevil Sharpe, Falmouth. Information respecting the photographic department may also be obtained from Mr. W. Brooks, Warren Road, Reigate, who has kindly undertaken to assist the Society. Balloon Photography.—The success achieved by M. Paul Desmarets in his balloon photographs, to which we referred last week, has created some sensation in the scientific world of Paris. The photographs obtained by him at Rouen were ex hibited and explained by M. de Fonvielle in a lecture delivered at Versailles Mairie on June 22, at a sitting of the Societe des Sciences Naturelies. They have been presented by MM. Paul Desmarets and Jovis to the Minister of War; M. Janssen will present them at the Academy of Sciences, and M. W. de Fon vielle to the Geographical Society. One of the photographs will be published next Saturday in the Monde Illustre, having been photographed on wood and engraved. The electri cal apparatus which enabled M. Paul Desmarets to obtain his cliches, and the obturators have a weight of 700 grammes only, including the elements required. Steps are being tsken for the systematic photographing of Paris and vicinity. One plate shows a piece of laud covered with houses, gardens, and roads in the vicinity of Rouen, measuring 300 yards by 300 yards, and executed on the scale of 1-800. The altitude was about 1,100 metres. The second photograph was in the direction of W.N.W. facing the horizon. All the Seine, from Rouen Railway Bridge to Guellebceuf, is seen with wonderful distinctness. The city, of Rouen was concealed by a dense cloud, and is lost in darkness The details on the banks can be magnified and examined at leisure. This remarkable ascent was made from Rouen on June 14, with Gabriel, a new balloon of 1,200 cubic metres belonging to M. Towis, and built for the express purpose of crossing the Channel, weather permitting. It is owing to the uncertainty of the weather that this enterprise, of which we have spoken already, has been postponed.—Nature,
- Aktuelle Seite (TXT)
- METS Datei (XML)
- IIIF Manifest (JSON)