. The Photographic art-journal . e no complaintas to partiality, the pictures must be sentanonymously, accompanied by a sealedpackage containing the name of the artistand the method of operating. The pic-tures and sealed envelopes will be markedwith corresponding numbers in the orderof their reception, and the latter will onlybe opened after the decision of the judges. As this prize is offered as a test of theskill of manipulators and not the excellenceof the camera, no instrument larger thanthe regular full size must be used. Da*guerreotypes taken by the mammoth ca-mera will be excluded. Arti
. The Photographic art-journal . e no complaintas to partiality, the pictures must be sentanonymously, accompanied by a sealedpackage containing the name of the artistand the method of operating. The pic-tures and sealed envelopes will be markedwith corresponding numbers in the orderof their reception, and the latter will onlybe opened after the decision of the judges. As this prize is offered as a test of theskill of manipulators and not the excellenceof the camera, no instrument larger thanthe regular full size must be used. Da*guerreotypes taken by the mammoth ca-mera will be excluded. Artists of all countries are invited tsend pictures for competition. All letters of enquiry upon the subjectwill receive prompt attention, and it isearnestly hoped the competition will be asspirited as possible. All who intend to compete for theprize should send in their names as earlyas possible, as lists of the competitors willfrom time to time be published. The pictures must be forwarded to myaddress, free of expense. E. Anthony,. THE PHOTOGRAPHIC ABT-JOTJMAL, Vol. 5. FEBRUARY, 1853 No. 2. A GENERAL REVIEW OF THE DAGUERREOTYPE.* BY M. A. GAUDIN. Translated from the French of La Lvimiere by TV. Grigg, A. B. SECTION V. ON THE CAMERA-OBSCURA; ON THE GETTING OF THE PROPER FOCUS. AND CF THE TIME- OF EXPOSITION. HE plate having beenpolished and having re-ceived the sensitivecoating, as has been de-scribed in the precedingchapter, it is ready forundergoing the actionof the light. This ope-ration is effected byplacing the plate in the3~of a cam? first invented the ca-nera-obscura received itsight through a very smalliperture which was the point4V^ of crossing of all the rays reflectedI^K from the objects placed before simple instrument was suffi-cient for giving a contracted imageof the or jects, with their colors andrelative angular dimensions. The imagewas produced at any distance behind theaperture; but its inteusity and clearnessbecame necessarily feebler in p
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectphotogr, bookyear1851
