UNITED STATES PHOTOGRAPHIC PATENTS.
October 3, 1893.

505813. Camera. E. R. Bullard, Wheeling, West Virginia.
505872. Frame for Pictures or Cards. H. Bierderman, New York, N. Y.
505968. Photographic Background. J. H. Titus, Tarentum, Pa.
506025. Photographic Posing Chair. J., Winter, Sr., Syracuse, N. Y.
506109. Half-Tone Negatives for Photo Processes. F. J. M. Gerland, Bayonne

506210. Roll Holder Camera. R. J. De Barrill, New York.

506343. Photographer's Changing and Developing Box. J. F. Snapp, Garza, Texas.

October 17.

October 31.

506873. Rack for Displaying Photographs. T. E. Wood, Kalamazoo, Mich.

507529. Picture Exhibitor. R. K. Doe, Duluth, Minn.

507785. Apparatus for Automatically Displaying Pictures. G. Cook, London, Eng. and C. K. Marr, Glasgow, Scotland.

507790. Camera Shutter. E. Decker, Cassopolis, Mich.

507805. Camera Stand. J. H. Green, Ishpeming, Mich.

November 7.

508204. Photographic Plate Holder. E. R. Bullard, Wheeling, West Virginia. 508319. Tripod Head. J. F. Ivarson, Boston, Mass.

November 21.

509120. Process of Making Relief Plates. J. F. Earhart, Cincinnati, Ohio.

509698.

November 28.

509611. Magazine Camera. L. and A. Chronik, Brooklyn, N. Y. Panoramic Camera. R. W. Stewart, Devonport, England. 509721. Photographic Retoucher. J. R. Dake, Medford, Wis. 509841. Photographic Camera Shutter. H. Casler, Syracuse, N. Y.

December 5.

510098. Paper Coating or Enameling Machine. W. Sparks, Brooklyn, N. Y. 510371. Photographic Printing Machine. C. Van Buskirk, Boston, Mass.

December 12.

510758. Method of Photogrammetry. C. B. Adams, Augusta, Georgia. 510759. Aerial Camera. C. B. Adams, Augusta, Georgia.

510805. Photographic Camera Shutter. W. H. Lewis, Huntington, N. Y.

December 19.

511043. Camera Stand for Bicycles. C. H. Campbell, Ocala, Florida. 511133. Photographic Camera. J. Fretwell, Providence, R. I.

January 9, 1894.

513233. Background Carriers for Photographers. M. M. Simmer, Henderson, Minn. 512512. Panoramic Roll Holder Camera. P. S. Marcellus, Philadelphia, Pa. 512601. Camera Shutter. H. B. Carlton, Rochester, N. Y.

512655. Photographic Camera Shutter. W. H. Lewis, Huntington, N. Y. 512671. Photographic Camera Shutter. C. W. Eddy, Ware, Mass.

January 16.

512914. Photographic Plate Holder. C. C. Spalsbury, East Orange, N. J. 513058. Combined Cane and Camera Tripod. Bessie Rahmer, New York, N. Y.

January 23.

513149. Combined Photographers' Bath and Printing Frame. F. Sandeman, London,

513517. Photographic Printing Frame. C. E. Lewis, Alma, Mich.

February 13.

514603. Photographic Embossing Press. D. D. McKee, Anderson, Ind. 514707. Magic Lantern. G. E. and V. H. Emerson, Newark, N. J.

February 20.

515080. Photographic Vignetter. H. L. Hultgren, Chicago, Ill. 515230. Photographic Camera Shutter. S. C. Jones, Rochester, N. Y.

March 6.

516076. Coin-Controlled Photographic Apparatus. J. W. Burton, Cleveland, Ohio.

March 13.

516278. Apparatus for Photographically Recording Time, Position and Speed. W. C. Petri, Wichita, Kansas.

March 20.

516861. Means for Regulating Rays of Light Passing Through Photographic Lenses. J. W. Fawcett, St. Kilda, Victoria.

March 27.

517119. Photographic Background Holder. C. O. Johnson, Sioux City, Iowa. 517164. Photographic Camera Shutter. W. L. Lightford, Indianapolis, Ind. 517360. Tripod on Support for Cameras. E. W. Perry, Jr., New York.

517364. Skylight for Photographic Galleries. W. Shaw, H. Shaw and J. Shaw, Jacksonville, Florida.

April 3.

517444. Support for Cards, Pictures or Like Articles. S. Dalsheimer and A. Greenleaf, Baltimore, Md.

517539. Camera. H. Casler, Syracuse, N. Y.

517733. Photographic Camera Multiplying Attachment. D. S. Cole, Washington,

Iowa.

April 10.

517870. Lime-light Apparatus. W. Lawson, Newton-le-Willows, England. 518073. Stand for Photographs. A. D. F. Randolph, New York, N. Y. 518074. Photographic Dark-Box. A. D. F. Randolph, New York, N. Y.

518075. Photographic Developing-Tray. A. D. F. Randolph, New York, N. Y.

518104. Stereopticon. E. Hudson, Washington, D. C.

April 17.

518346. Photographic Album. J. Ekval, Fargo, N. D.

518372. Registering and Marking Apparatus for Photographic Film Holders. H. Mackenstein, Paris, France.

April 24,

518802. Roll Holder Camera. E. B. Barker, Newark, N. J.

518929. Photographic Printing Frame. R. M. Hunter, Philadelphia, Pa.

May 1.

519247. Camera Shutter. L. F. Eiden, East Warren, Pa.
519276. Magazine Plate Holder. A. Stegemann, Berlin, Germany.

May 8.

519645. Photographic Plate. T. C. Roche, Brooklyn, New York. 519646. Photographic Plate. T. C. Roche, Brooklyn, New York.

May 15.

519800. Photographic Vignetter. J. B. Walker, Kansas City, Kan.

519872. Coin Controlled Photographic Apparatus. J. A. Parsons, Rocky River, Ohio.

May 22.

520034. Photographic Camera Multiplying Attachment. D. S. Cole, Washington, Iowa 520058. Lamp Sketching Camera. C. R. Jenne, Fort Wayne, Ind. 520198. Photographic Shutter. H. R. Turner, Rochester, N. Y. 520290. Photographic Plate Holder.

E. R. Barker, Newark, N. J.

May 29.

520696.

Camera Shutter. W. J. McCollom, Swededale, Iowa.

520707. Art of Reproducing Objects in Relief or Intaglio by the Aid of Photography. M. Russo, Rome, Italy.

June 5.

520950. Camera. T. M. Clark, Newton, Mass.

520953. Picture Exhibitor. J. E. Ecklund, Rockford, Ill.

520972. Photographic Camera Shutter. A. T. Tisdell, Brooklyn, N. Y.

521064.

Method of and Lens for Making Photographs. H. Van de Weyde, London,
England.

June 12.

521362. Electric Arc Light for Magic Lanterns. C. Beseler, Jersey City, N. J.

June 19.

521563. Roll Holding Camera. A. Delug, Stuttgart, Germany.

521569. Photograph Album. G. Koll, New York, N. Y.

521659. Screen for Half-tone Process. M. Levey, Philadelphia, Pa.

521668. Photograph Display Cabinet. H. W. Potteiger and W. A. Kohman, Reading, Penn.

521705. Process for Producing Positive Phonoscopic Plates. G. Demeney, Paris, France.

July 3.

July 10.

522372. Apparatus for Retouching Negatives. C. Hornberger, Harrisonville, Mo.

522921. Magazine Photographic Camera. G. P. Spooner, Bron-y-Garth, England.

July 24.

523323. Photography by Artificial Light. B. M. Clinedinst, Washington, D. C. 523336. Panoramic Camera. F. F. Dumke, Milwaukee, Wis.

July 31.

Design Patent 23518. Photographic Card Mount. J. P. Odgers, Philadelphia, Pa.

August 7.

524142. Photographic Camera. J. C. Hegelein, New York, N. Y. 524143. Camera Shutter. J. C. Hegelein, New York, N. Y.

August 14.

524301. Lantern Slide Mat. R. S. Benedict, New Orleans, La.

524670. Iris-Diaphragm Shutter. P. Rudolph and O. Nather, Jena, Germany.

August 21.

524726. Device for Cutting Cards with Beveled Edges for Photograph Mounts. B. McHugh, Ottawa, Canada.

524802. Magazine Camera. A. A. Foiret, Nice, France.

524949. Magazine Camera. J. F. Parsons, Bristol, England.

August 28.

525238. Photographic Camera. J. Tascher, Chicago, Ill. 525239. Magazine Camera. J. Tascher, Chicago, Ill.

Editorial Table.

THE PHOTO AUTO-COPYIST.-From the Autocopyist Company, 72 London Wall, London, E. C., England, we have received examples of prints made by this process in printing ink. Very fine tools and materials are required, and the process is quite easy to work. The British Journal of Photography thus describes it:

'A sheet of vegetable parchment, covered with a layer of gelatine, is cut to the size of the printing frame, and sensitized in a weak solution of bichromate of potash. the strength of the bath varying from 2 per cent. in summer to 3 per cent. in winter, according to the temperature. To the bath a few drops of ammonia should be previously added. The sheet is allowed to remain in the bath for three minutes, until it is turned a bright yellow. It is then removed, squeegeed down to glass, and dried in the dark. The time of drying varies, but the demonstrators recommend the sensitizing over night, so that the film will be ready for using next morning, when it is stripped from the glass and exposed in an ordinary frame behind the negative. The action of light renders the film hard and insoluble beneath the clear portions of the negative, and turns the film to a brown color, hence printing is not a difficult matter. When all detail is out, the film is reversed, so that the light may harden the back of it. It is then soaked in water for two hours. The bichromate is washed out of the portions unacted on, which swell and give an embossed appearance to the film, the parts acted on being sunk into the gelatine. The film is then softened with a solution of water, gelatine and ammonia, which is poured off and the film dried with a cloth. Inking takes place with ordinary lithographic ink by means of rollers, a stiff ink being used for the dark shadows, and a thin ink for the light half tones, etc. Any color, or mixture of colors, may be used by varying the tint of the ink, which only adheres to the portions affected by the light. After inking, a sheet of paper is laid on the film, and inserted in an ordinary copying press. Pressure is applied in the ordinary manner, and the process repeated ad lib. The price of the apparatus is exceedingly moderate, being only £3 for half plate, which may be recommended to photographic societies for circulating copies of medalled pictures, etc."

The pictures do not possess the brilliancy of silver prints but are very good as copies.

"Index Rerum Photographic." by Dr. John H. Janeway, U. S. A., continued from page 46, vol. i

MINIM-Lat. Minium, Smallest-The smallest liquid measure apoth.=1 grain.

MIRROR, REVERSING-A mirror so placed that by its means the reflected image, and not the object itself, is photographed directly as reversed. The increasing employment of reversed negatives for the carbon, artotype, asphaltum and other processes renders its use a necessity. MIRRORS, SILVERING OF-See Glass, Silvering of.

MODEL, STUDY OF-The photographer's first care should be the study of his model before placing it under the objective's inflexible and undiscriminating eye. Here begins the role of light, with the infinite. gradations by which it can indicate form. It is, therefore, of the utmost importance to comprehend the characteristics of the model, and how they may be best rendered so as to modify the action of light, and thus secure in the portrait suggestions of the true type and character of the sitter.

MOISTURE as a lubricator-Those burnishing or having prints burnished by the modern rotary burnisher will find that the natural moisture of the freshly mounted prints adds greatly to its finished appearance, acting, as it does, the part of a lubricator, and it is all that is needed by these perfect machines, which neither soil the card nor remove the retouching or spotting out, so often found necessary to make the print appear at its best. Amateurs who are unable to mount, spot out and burnish all in the same day, and thus allow the print to become dry, can overcome this difficulty by using sweat box, which can be made of a fairly light tin cake or cracker box, of suitable size, by placing well-soaked blotters or cloth in the bottom, with two or three thin strips of wood laid over as a floor for the prints to rest on. A light wooden frame, fitted inside near the top, with cords run across like the strings on a harp, will assist in keeping the mounts in an upright position, and each by itself. The prints should be wiped off with a soft, damp cloth, to remove any paste that may adhere to their faces; then, after spotting out as needed, place them in this sweat box a day or a night at least before burnishing longer will do no harm, if properly mounted.

MOLYBDIC ACID-See Acids-It has been lately recommended as a bleaching agent. Guignot has used it for that purpose, and found it to be a good solvent of Prussian blue.