Fig. 3.
Cut a black piece of cardboard as indicated in [Fig.] 3 C; the dotted lines indicate the sides to be turned down. This shade is fixed on to the camera.
Fig. 4.
Pass through the holes, S S, an iron rod or a long needle, which must pass likewise through the upper angle of the triangles, forming the sides, ([Fig. 1]). When your lens has been fixed on the round hole of the square your camera is complete.
The shade produces complete obscurity so that the operator can see in the middle of the camera the object or person he wishes to photograph.
In order to fix it on the photographic apparatus, one may fasten a wire, in the form of an elongated U, just below the mirror at E.