A Manual Of Photography

APPARATUS NECESSARY FOR PHOTOGRAPHY ON PAPER. 203 screen or door more perfectly, in the act of falling; e is a door at the back, through which the picture formed on the opaque glass is examined; /, a pin, keeping the door, d, in its place. The following figures (Tigs. 53, 54, 55) represent a more perfect arrangement. Its conveniences are those of folding, and thus packing into a very small compass, for the convenience of travellers. It is, however, only adapt- ed for views, and not for portraits. With the camera obscura properly ar- ranged, and the copy- ing frame, the photographic student who confines 1ns attention to the processes on paper has nearly all he requires. For the convenience of adjusting the instrument to different heights, and to different angles of elevation, tripod stands are con- venient, but not altogether indispensable. They are made in several ways; the two figures, 56 and 57, representing those which appear best adapted to the use of the traveller. The arrangement of compound legs shown in Fig. 56 ensures greater steadiness than the other ; but the range of movement in Fig. 57 gives it some advantages. Beyond these things, a few dishes, such as are represented in Fig. 58, A A; and a frame B, upon which a photograph can be placed for the purpose of being washed, are the only things required for the practice of photography, except those pieces of apparatus which, belonging to special processes, will be found