CHAP. I. A BRIEF HISTORY OF THE ART. As in all cases of great and valuable inventions in science and art the English lay claim to the honor of having first discovered that of Photogenic drawing. But we shall see in the progress of this history, that like many other assumptions of their authors, priority in this is no more due them, then the invention of steamboats, or the cotton gin. This claim is founded upon the fact that in 1802 Mr.... more...

Chapter IVARIETIES OF BROMIDE PAPERS AND HOW TO CHOOSE AMONG THEM   What is bromide paper? It is simply paper coated with gelatino-bromide of silver emulsion, similar to that which, when coated on glass or other transparent support, forms the familiar dry-plate or film used in negative-making. The emulsion used in making bromide paper, however, is less rapid (less sensitive) than that used in the manufacture of plates or films of... more...