Bromide paper : instructions for contact printing and enlarging (1896)
Just, E. A · Bradford : P. Lund, Humphries · leaf 129
he self-aciling regulator it requires great attention, as it is necessary to be continually moving the mirror or the whole apparatus by hand. Solar Cameras. — Such solar cameras are either firm enlarg- ing cameras with horizontal axis, at which the sun's rays are guided to the condenser by a mirror… … Fig. 21. The Heliostat. — Fig. 21 shows the mirror arrangement used for the reflecilion of sunlight for enlarging. The mirror s is turned on its axis a b, by a cog-wheel having a spiral screw h, so that its inclination can be changed at will. With the screw v the whole mirror frame, together with…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-421-295.webp)
