ENLARGING ON BROMIDE PAPER. 
H5 
arrange so that no light reaches the sensitive surface 
except what passes through the lens. 
The simplest apparatus for our purpose consists of 
two cameras fixed together—one small to take our 
small negative, the other large enough to hold our 
largest sheet of paper. The small camera may be of 
the simplest kind. It requires no “ movement ” except 
a focussing one; in fact, a “toy” camera will do. The 
large camera requires to be adjustable to various 
lengths, and it is convenient to have it with a certain 
Fig. 32. 
amount of vertical and horizontal movements. Fig. 32 
shows our apparatus made up of two such cameras, the 
larger taking a plate or sheet 10 by 8 inches. The lens 
_of about 3I equivalent focus—is fixed to the small 
camera, and the dark slide of the latter is used to hold 
the negative. The sheet of bromide paper is placed in 
the dark slide of the large camera, being backed by a 
sheet of glass to keep it in position ; and the whole 
apparatus is either turned towards the sky, or towards 
a piece of ground-glass in a window. If the small 
camera is turned towards the sky, and if there are 
