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The photographic news
- Bandzählung
- 27.1883
- Erscheinungsdatum
- 1883
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- Englisch
- Signatur
- F 135
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- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1300, August 3, 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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488 THE PHOTOGRAPHIC NEWS. [August 3, 1883. Several methods have been suggested for the preparation boundary between a dark and light atmosphere ; that is to of a gelatino-bromide film paper for negatives, but nothing say, supposing we expressed the intensity of the atmosphere has come before the photographic public in a very prac- on one side of the rainbow by the figure 3, we should esti- tical form. One of the most recent patents in this direction mate the intensity of the atmosphere beyond by the figure 6. is that of M. Thiebaut, a photographer in the Rue Laffitte, Paris. M. Thiebaut takes a gelatinised sheet of paper, damps it, and attaches it on a glass by bands of paper pasted at the edges. When dry, it is covered with collodion containing about two per cent of castor oil. The glass is then levelled, and coated in the dark-room with a tepid emulsion of bromide of silver, and after resting about five minutes, the glass is placed upright in a drying room with a temperature of from 62° to 668 Fahr. Here it remains about twelve hours. The sensitive paper is exposed, deve loped, and fixed in the usual way, and after being allowed to dry, the film is peeled off the paper by hand, and be comes an ordinary transparent negative. It is related, in connection with Focarde’s statue of “ You Dirty Boy,” the photographic copyright of which, as we noted last week, brought such good luck to its possessor, that the expression of anguish on the urchin’s face was brought about by the sculptor pulling his model’s ear at the fixed tariff of a shilling a pull. As forty pulls were given, the boy doubtless was well pleased with his bargain. The incident, however, furnishes one with food for reflec tion as to how the expressions of the innumerable crying children which have been so popular were obtained. Rejlander's picture called, by him “ Mental Anguish,” which afterwards sold enormously under the name of “ Ginx’s Baby,” was the result of an accident, the artist, in pure desperation at the wilful perverseness of the infant, exposing a “ malice aforethought ” at the very moment it was in the paroxysms of an appalling roar. This picture set the fashion for crying children, and since then we have had them in every stage of fractiousness, from the incipient “ whinnick ” to the fully developed squall. But they could not all have been accidents. We are really sadly afraid that barbaric means similar to Signor Focarde’s method have been resorted to in most instances, and possibly, even, the much to be dreaded pin brought to bear upon the unlucky infantile models. It is to be hoped that a hint of such doings will not reach the ear of the British matron, or the sale of these pictures will be decidedly affected. Mr. Henderson points out that if an emulsion is prepared with a very large proportion of gelatine, the removal of the inert salts by washing is no longer absolutely essential. The mass of gelatine prevents crystallisation. These facts should have interest for those who make sensitive pellicles Or films. Mr. Mayland, of Deal, sends us by post some delightful studies of sea and cloud, which would be invaluable to the marine painter. He forwards us also a photograph of a rainbow, which seems to us of particular interest to the physicist. And for this reason. The bow is simply repre sented as a dark band, but, strange to say, it marks the In a word, there is a sky twice as intense on one side of the rainbow than on the other, the bow making a sharp divi sion ; so that it is very possible photography may help to explain the phenomenon of the rainbow more clearly than has yet been done. Our contemporary the St. Louis Photocirapher makes the amende honorable, and apologises for quoting our “Notes’’ without acknowledgment; not to be behindhand in courtesy, we regret ever having mentioned the circumstance. By the simple reflection of an image, M. Wolff is enabled to take note of the least oscillation of the earth. He sets to work as follows. Some ninety feet under ground, where no vibrations from above are likely to affect the observations, is a tunnel one hundred feet in length. At one end of the tunnel is a bowl of mercury reflcting on its surface a certain object, or point, and by a system of fixed mirrors this same point is reflected from the other end of the tunnel. If the reflections of the two surfaces—the mobile and fixed— coincide, the earth is steady ; but if the reflected images do not coincide, then there is evidence of an oscillation. The least erratic movement of our sphere is thus recorded, and by a simple photographic tell-tale the motions might be written down without trouble. In La Mature we read of photographs being taken by M. Louis Dor by moonlight with the aid of some new gelatine plates of a most sensitive kind, which M. Lumiere has patented. Moonlight photographs in this country have long been dismissed from the category of wonders, but although many of our readers have deemed their results sufficiently curious, none, we believe, ever dreamt of taking out a patent for films that could be impressed by moonlight. A theory of considerable interest to photographers is just now under discussion by Dr. Oliver Lodge and Lord Raleigh. It concerns the so-called dark plane to be seen above hot bodies in dusty and illuminated air; that is, just above a hot rod of iron or hot iron plate, there is always, as many of our readers must have noticed, a per ceptible dark layer, and it is this region of darkness—so it appears to the eye—which is the subject of discussion. Tyndall has demonstrated, if he was not the first to point out, that it is dust particles in the air that make it luminous, and that it is quite possible for a ray of light to be imperceptible to the eye if there are no dust particles in its path to reflect the light. The dark plane over a hot object has, therefore, been explained by the fact that the dust in the dark region has either been burnt up or dried up by contact with the hot body. Lord Raleigh, by the simple device of using a cold body, instead of a hot one, succeeded in getting a down-streaming dust-free space instead of an up-streaming one, and this proved that this theory of burning or drying up of the
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