Unfortunately, very few daguerreotypes with the photographer's name provided. It is estimated that only 25 percent of all wear silver images authorization. In addition, a small percentage of unlabelled daguerreotypes, which can be proved by other evidence, however, the authorship. These include items such as studio curtains, chairs, table cloths and other accessories, but be warned against too hasty assignment it is - sometimes they were supposedly "unique features" more widespread than one might suspect.
As early as the 1850s turned her into one studio furniture series, which may therefore appear on daguerreotypes various studios alike.
The safest is the direct authorization. This can be very different.
Especially in Europe of a label on the back of the daguerreotype was quite common.
A less elegant method was the hammering of the name with a corresponding punch tool. In contrast to the actual stamp plate (manufacturer) the writing of daguerreotypists was logically not hidden under the Passeapertout. UP-Fig. punch on a silver oval shaped picture of daguerreotypists Abresch. The lettering is clearly visible from outside through the cover glass.
Larger studios employed several surgeons, who were responsible for the shooting. This sometimes left on the back of the copper plate with their respective names so that can succeed in such cases, an authorization. However, these cases are extremely rare, especially as they remain "invisible" and are only found during restoration work. UP-Fig. The incised inscription "John" refers to the natural scientist John Frederick Goddard, who in the early months of Richard Beard was working in London.
Especially in France and England are engraved the names of daguerreotypists directly in front of the silver plate, so it could see through the protective glass. UP-Fig. Engraved authorization, which is also linked with a dedication: The French daguerreotypist Guesne over appropriated on 9 October 1850 this daguerreotype to the French sculptor Henri-Charles Maniglier.
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