The Optical Magic Lantern Journal (March 1901)
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followed by pure-colour synthesis, is not even stated, and the principle of analysis is no more definitely stated than that the negatives should be made by “ orange," “ green,” and ‘‘violet’’ light; and in the ‘‘melanochromoscope " credited to Louis Ducos Du Hauron, and only recently manufactured for sale, ths photographs are sappposed to be made through the same screens that are used for synthesis. Such loose methods may serve as playthings, but they no more represent scientific trichromatic photography than a child’s use of a sixpenny prism represents uhe science of spectrum analysis.
Since this part of my lecture was in manuscript I have had the great pleasure of perusing a treatise on trichromatic photography by an English author, who has
not only recognised the principle of colour-curve analysis |
and pure colour synthesis, but has presented the subject in a most admirable manner. No doubt many who have found my own essays too concise and dogmatic in stylo to appeal to them successfully will find Mr. Tallent’s fuller
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arguments and illustrations sufficiently convincing. It |
needed only the publication of such a treatise as this to put @ period to my aggressiveness in a fight which has become distasteful to me.
(To be continued.) :
3| PATENT INT LLIGENCE,_
The following List, relating to current Patent Applica: tions, is compiled expressly for the ‘‘ Optical Magic Lantern Journal” by W. P. Thompson & Co., Patent Agents, of :
322, High Holborn, London, W.C., to whom all enquiries for further information should be addressed.
No. 20933,
20938.
Recent Patent APPLICATIONS.
19th November, 1900. Emil Donitz. ments in photographic shutters. 20th November, 1900. Wilhelm Peisker, Fritz Schlomka, and Hermann Kautz.
Improva
or membranes of phonographs and the like instruments. (Complete.)
2lst November, 1900. Frank West Suter. Apparatus for printing photographs from negatives.
23rd November, 1900. John Colquhoun Manifold. An improved stereoscoping device.
23rd November, 1900. Edward Sanger Shepherd. Improvements in or relating to photographic cameras. . ;
19th November, 1900. Alfred Charles Jackson. Improvements in and relating to hand cameras. (Complete.)
26th November, 1900. Henry William Hamblin Palmer. Improvements in apparatus for photographing and exhibiting cinematograph and mutoscope ordinary pictures.
27th November, 1900. Edwin A. Reeves. Improvements in coin-freed apparatus for producing sounds and exhibiting pictures. (Complete.)
28th November, 1900, Arthur Salmon. Improvements in or relating to photographic apparatus.
21034.
21185. 21239.
21279.
21339.
21495.
21537.
Improve° ments in or applicable to the diaphragms |
"93121,
21545. 21594.
21711, 21817, 21840.
21848.
22697. 22849,
22971.
22981.
23339.
296. 1139.
1183.
1690.
1818.
2147.
28th November, 1900. Leon Gaumont. Improvements relating to cinematographs.
29th November, 1900. Arthur Lewis Adams. Improvements in denoting speeds of photographic shutters.
30th November, 1900. Edward Bethell Fox. An improved photographic developing dish.
1st December, 1900. Birt Acres. A process for
photographing in colour.
December, 1900. Allan Coats, jun. An
improved method of ascertaining when the
sensitised plate or film of a camera is in
focus.
3rd December, 1900. John Archibald Purves and William Thompson Purves. An improved form of optical apparatus for use in lighthouses and the like.
5th December, 1900. Frank Edward Hampton. Improvements in and relating to photograph frames.
6th December, 1900. Napoleon Conti. Improvements relating to photographic cameras. (Date applied for under Patents, etc., etc., 1883, Sec. 103; 9th May, 1900, being date of application in France.)
12th December, 1900. Hans Léscher. Improvements in photographic copying machines.
14th December, 1900. Albert Martin William Lehfeldt. An improved apparatus for iaterchangeably exhibiting pictures, photographs, and advertisements.
15th December, 1900. Philip James Job and Thomas Naylor. A new or improved apparatus for changing photographic plates or cut films,
15th December, 1900. George William Brown and George Robson Beaumont. Improvements in and connected with kinematographs and magic lanterns. (Complete.)
18th December, 1900. Percival Warwick Davies. Improvements in apparatus for obtaining and projecting animated pictures.
18ta December, 1900. George Frederick Hatton Improvements in apparatus for taking and
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viewing or exhibiting cinematographic pictures.
1st January, 1901. Thomas William Henry. New and improved photo-mechanical
methods and meang for producing curved printing plates and rollers.
4th January, 1901. Charles Henry Watson. Photographic enlarger.
17th January, 1901. Jules Carpentier. Improvements in enlarging or like cameras.
18th January, 1901. Edward Townshend Driffield. Improvements in photographic “cameras adapted to take panoramic views.
24th January, 1901. Raymond Camile Marie de Bercegol. Improvements in photographic apparatus or cameras and to means for loading or charging the same with sensitised plates and films in daylight.
26th January, 1901. William John McConnell. Improvements in and relating to photo
graphy. 31st January, 1901. John Howard Ross. Improved gas burner adapted chiefly for
acetylene for magic lantern or other use where a powerful concentration of light is required.