Publisher's Synopsis
Excerpt from Cantor Lectures on Recent Advances in Photography: Delivered Before the Society of Arts, January and February, 1882
We propose, between us, to take a daguerreo type picture. N ow, the operation of sensitising is very nearly. Finished. It has been treated with iodine, and then with bromine, and now it is having a final submission to iodine. The plate Mr. England prepared has now been exposed one minute; Mr. England is rather doubtful about the sensitiveness of the plate, but I am afraid, myself, it is rather over-exposed. Mr. England is now going to develop the' picture, and he will do so by the use of mercury. He has here the original mercury box with which he was accustomed to_ manipulate. He will hang it against the wall, and light a small spirit lamp under a bowl of mercury beneath it. The mercury fumes will rise through an orifice into the box, and so on to a plate; he will watch it'from time to time, until it is de veloped, when we will show it to you. [a copy of an engraving was here taken whilst illuminated by the electric light.
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