A New Camera for Bird Photographers 



39 



which works upon the smaller cogwheel, which is fast to the end 

 of the lower roller, D. If the key were freed, the lower roller 

 would at once revolve and pull down the curtain from the upper 

 roller and the curtain would then be wound upon the lower roller 

 again. 



The upper roller is furnished with a cog attachment, and a 

 small lever (Fig. i, F) catches into each cog as the roller is wound 

 up and keeps the roller from turning back. In this way the curtain 

 is wound up on the upper roller and held there. 



The small lever or catch (Fig. i, F) is attached to a longer 

 lever (Fig. i, G). When the distant end (H) of the long lever is 

 raised a little the end of the small lever at E is forced upwards 

 and releases the roller, and the tension of the spring below winds 

 the curtain back upon the lower roller. 



A mirror (I, I) set in a light wooden frame is hinged at the upper 

 end and rests upon a bed of felt-covered strips of wood all around 

 (J, J, J). The mirror is hung at an angle of 45 degrees to the 



plate, and is placed so that the distance from 

 the lens to the surface of the mirror and 

 up again to a ground glass (Fig. i, K K) 

 set into the top of the box, is the same dis- 

 tance in a straight line from the lens to the 

 plate. The image comes through the lens 

 upon the mirror and is reflected upwards 

 upon the ground glass, 

 where it is properly 

 focused by means of the 

 ordinary rack and pinion 

 attachment (Fig. i, Q). 



The mirror is raised 

 by means of the combi- 

 nation of levers (Fig. 2, 

 L, L, L). A spur at- 

 tached to this lever at 

 M projects through the 

 side of the box and 

 works up and down in 

 a slot (N) cut there for 

 its reception. When 

 the spur of the lever is pressed downwards the mirror (Fig. 2, I, I) 

 is raised and closes tightly upon a felt-lined and light-proof bed 

 (O, O) upon the inside of the top of the box and surrounding the 

 ground glass. 



interior of left side of mirror camera 

 (hood raised) 



