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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1839. Not illustrated. Excerpt: ... CHAPTER II. Practical and Historical Details.--Partnership of the two Discoverers.--Account of Niepce's Processes.--His own Notes.--Daguerre's Remarks.--Asphaltum the Substance employed for receiving the Impressions of Light--This the old System.--The Solvent.--Its Application.--Description of some Results.'--Additional Notices.--Daguerre's improvements on Niepce's Processes.--Correspondence.--Experiments.--Disappointments.--Daguerre unquestionably prior to Niepce in the application of Iodine. So early as 1814, M. Niepce engaged in a series of experiments to determine the possibility of fixing the images in the camera obscura; but more particularly to perfect his methods of copying engravings, applied upon substances sensible to the influence of light. In 1824, M. Daguerre also was making researches of an analogous description, with this difference, that his experiments were directed solely to the fixation of the image obtained by the camera, for he regarded the copying of engravings by these processes as of no importance to art. In 1829, M. Daguerre entered into partnership with M. Niepce in order that they might prosecute the subject in common. M. Niepce had named his discovery Heliography, and wrote a description of it to be communicated to M. Daguerre. To this account which follows, M. Daguerre now adds a few notes, chiefly including his remarks made to M. Niepce himself. These notes are not produced for the purpose of criticism, but simply with a view to explain the true state of photogenic science when this partnership was formed. From the description of Niepce, his method might other Delineation by the sun. wise appear to have reached a degree of perfection, which, with all the subsequent improvements even, it is very far from having yet attained. "DESCR...
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