Practical photography on glass and paper ; a manual containing simple directions for the production of portraits, views, & c., by the agency of light, including the collodion, albumen, calotype, waxed paper, and positive paper processes
A photography manual by Charles A. Long, published in London by Bland & Long in 1854, teaching amateurs and practitioners the collodion, albumen, calotype and waxed paper processes for portraits and views. The one picture is a plain line diagram of a rectangle with corners lettered A, B, C and D and a point E at the centre, the kind of geometric key used to explain lighting or camera placement. A designer might take from it the clean, schematic labelling of an early technical diagram, with letters set at the corners as a minimal device.
