An improvement in the construction of these plates has been invented by Geo. Engle-hard of New York City. Tha method employed by him is this, instead of forming the base of the plate of copper, and then coating it with silver, a pure zinc plate is used-for the electrotype process, or a zinc plate first coated with copper and then with silver,and afterwards polished in the usual manner. Mr. En-glehard thinks these plates take impressions more readily and leave a finer picture than those made by the old process. The expense of making these plates is less than those ruade of copper. The inventor has taken measures to secure a patent. A tew drops of kreosote on brown paper, put in the holes of rat, it is said, wilt WM lem away.
This article was originally published with the title "New Process for making Daguerreotype Plates" in Scientific American 8, 35, 276 (May 1853)