The photographic news

• Bandzählung: 7.1863
• Erscheinungsdatum: 1863
• Sprache: Englisch
• Signatur: F 135
• Vorlage: Hochschule für Grafik und Buchkunst Leipzig
• Digitalisat: Hochschule für Grafik und Buchkunst Leipzig
• Digitalisat: SLUB Dresden
• Rechtehinweis: Public Domain Mark 1.0
• URN: urn:nbn:de:bsz:14-db-id1780948042-186300004
• PURL: http://digital.slub-dresden.de/id1780948042-18630000
• OAI: oai:de:slub-dresden:db:id-1780948042-18630000
• Sammlungen: LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
• Sammlungen: Fotografie
• Strukturtyp: Band

• Digitalisat: SLUB Dresden
• Strukturtyp: Ausgabe

222 THE PHOTOGRAPHIC NEWS. [May 8, 1863. in a rack to dry, until we find it convenient to clean them. When they are dry, a line of varnish is put round the edges to prevent the film from being removed in the following operations of cleaning and intensifying. The plates are wetted again, and fixed with cyanide of potassium. Intensify according to the character of the picture. If the negatives are nearly dense enough, and butslight intensifying is required, pyrogallic acid, 1} grains to the ounce of water, and one or two drops of silver from a 30-grain solution. When the negatives are feeble they are treated to a weak solution of iodine, which is floated upon the plates for a short time; they are afterwards copiously washed previous to applying the pyro and silver.—At other times, intensify by pouring on a saturated solution of bichloride of mercury, until the film is of a grey colour, after which it is washed, and a solution of iodide of potassium, of one grain to the ounce of water, is applied until a greenish yellow tint is produced. In printing use Hive paper for soft negatives, and Saxe paper for hard ones. The sensitizing bath contains 90 grains of silver to the ounce ; the paper is floated upon it from three to five minutes, according to temperature. Tone with Maxwell Lyte’s formula. Mr. Mayland’s Formula.—The prints very delicate and full of half tone, and, at the same time, exceedingly vigorous and round. Tone, a rich, warm neutral tint. The silver hath is 35 grains to the ounce, and is very slightly acid, with nitric acid. Collodion, a good commercial bromo-iodized sample. Developing solution— Protosulphate of iron (in summer) 15 grains Acetic acid ... 20 minims Water 1 ounce. The solution is better for being a few days old. In winter the iron is increased to 30 grains. Intensify before fixing with— Pyrogallic acid 1 grain Acetic acid ... ... ... ... 40 minims Water ... 2 ounces with a few drops of 15-grain solution of silver. Fix with hypo. In printing, good commercial albumenized paper; an 80-grain silver bath ; two minutes floating and rapid drying. Tone with the gold and acetate of soda bath. Fix with hypo, one part in five, never used twice. Mr. Hawke’s Formulas.—The prints are delicate, brilliant, and very bold. The tone, rich purple brown. The silver bath.—40 grains to the ounce, slightly acid with acetic acid. Commercial bromo-iodized collodion, frequently mixed. Developing solution.— Protosulphate of iron ... ... ... 2 drachms Glacial acetic acid 1 drachm Water 1 ounce Alcohol quant, stiff. Intensify before fixing with pyrogallic acid two grains, citric acid one grain in an ounce of water and a few drops of silver. In printing, use Sandford’s thin Saxe albumenized paper, a strong silver bath, and acetate of soda and gold toning bath. Mr. Parkinson’s Formula:.—The prints are very brilliant and bold and finely modelled. The tones a rich, warm, intense black, with very warm, flesh-like half tints. The silver hath has 30 grains to the ounce, always treated, when new, with oxide of silver, and then slightly acidified with nitric acid. Commercial bromo-iodized collodion, often a mixture of Thomas’s and Ramsden’s, and for rapidity Rouch’s, or a mixture of Thomas’s negative and Mawson’s positive. Developing solution, a 20-grain iron solution with 20 minims of acetic acid and alcohol quant, suff. Print on albumenized Rive paper excited on an 80-grain silver bath slightly acid with acetic acid. Tone with gold and chloride of' lime, Ommeganck’s formul. LANDSCAPE AND INSTANTANEOUS PIIOTOGRAPIIY. Mr. Vernon Heath’s Formula.—The prints exquisitely delicate, brilliant, with rich and perfect warm tones. A 36-grain silver bath nearly neutral, or very slightly acid with nitric acid. Collodion.—Thomas’s bromo-iodized magnesian collodion. Deceloping solution— Protosulphate of iron ... ... ... 8 grains Glacial acetic acid ... ... ... 20 minims Water ... ... ... ... ... 1 ounce Alcohol ... quant, stiff. Intensify with pyro and silver before fixing. Print in albumenized paper salted with chloride of barium: excite in strong silver bath ; tone with god and acetate of soda bath. Mr. Blanchard’s Formula ;—The instantaneous pictures by this formulie are well known as exceedingly well detailed and brilliant. The silver bath contains 40 grains of pure recrystallized nitrate to the ounce, neutral or with a very slight trace of nitric acid. The Collodion contains a large proportion of bromide, and is prepared expressly for instantaneous photography. Developing solution— Protosulphate of iron Glacial acetic acid ... Water Alcohol ... 30 to 50 grains ... ... 20 minims ... ... 1 ounce quant, suff. Intensify by different processes according to quality of image. Mr. England’s Formula.—The perfect detail and delicacy of these instantaneous pictures are well known. The silver bath contains 40 grains of pure nitrate to the ounce, and is worked neutral. The Collodion contains 3 grains of iodide of ammonium, and 3 grains of bromide of cadmium to the ounce, and is sometimes mixed with commercial samples. The Developing solution— Protosulphate of iron ... ... 48 grains Glacial acetic acid from ... 12 to 20 minims Water ... 1 ounce Alcohol ... ... quant, stiff. Intensify before fixing with a two-grain solution of pyror citric acid, and a little silver. Print on albumenized paper prepared with 4 grains of chloride of barium, and 4 grains of chloride of ammonium to the ounce. Excite on a 60-grain silver bath ; print very deep; fix in saturated solution of hypo, then tone in a solu tion of hypo and gold, both fixing and toning baths always used fresh. 9rocecdmugs of Sotieties, London Photooraphic Society. The usual monthly meeting of this Society was held on the evening of Tuesday, the 5th instant. Mr. Glaisher, F.R.S., in the chair. The minutes of a previous meeting having been read and confirmed, Mr. J. Parsons was elected a member of the Society. Mr. Richards exhibited and explained the photographic apparatus of M. Bertsch, consisting of a small “ automatic camera for producing small pictures, a stereoscopic camera, and a megascopic or enlarging camera, for producing amplified proofs from the small negatives. He remarked that the end ot