DA-GUERRE'O-TYPE. (da-ger'ro-type,) n. [from Daguerre, the discoverer.] A method of fixing images of objects by the camera obscura. A copper sheet, plated with silver, well cleaned with diluted nitric acid, or polished, is exposed to the vapor of iodine, which forms a very thin coating. This sheet is placed in the camera obscura, in which it remains a very short time; it is then taken out and exposed to the vapor of mercury; then heated to 167 degrees Fahrenheit, and the images appear as by enchantment.