Wall, E. J. (Edward John), 1860-1928 · Boston, Mass., American Photographic Publishing Co. · leaf 140
COLOR PHOTOGRAPHY 128 board. The shorter side of these plates should slope about 5 mm above the board. The longer side should have a slit about 25 mm long, through which passes the binding-screw. This slit enables one to shift the position of the mirrors slightly. The mirrors are supported be- hind… … should be perpendicular to the surface of the mirrors, that is, at an angle of 45 degrees to the bottom of the box. In order to support the mirrors they may have on their upper edges a narrow metal strip, to which may be soldered a hard brass or steel spring, which may be hooked to the baseboard,…
Color photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
