instead of sliding in a brass tube, is bedded in the front of the 



Camera, by which 

 an increase of light 

 is obtained, the 

 quantity admitted 

 being regulated by 

 a diaphragm hav- 

 ing apertures of 

 different diameter. 

 The back part of 

 the camera slides 



into the front and ' 

 to secure a very ac- 

 curate adjustment 

 Fig. 2. is mounted with a 



screw. It is moved in or out by turning a small handle at the back. 

 This camera is arranged with two grooves (a and 6), so as to allow 

 the use of two lenses of different focal powers, according as por- 

 traits or views are desired. 



The frame with the ground glass (Fig. 3) is furnished with a 

 moveable top and sides, which when 

 extended, exclude the light, and 

 aid the operator in determining the 

 best focus. 



Fig. 3. 



The second frame, (Fig. 4) 

 consists of a box (6) made to 

 receive thin wooden frames 

 adapted to the various sized 

 daguerreotype plates, which 

 may be placed horizontally 

 or vertically, at pleasure : 

 this frame is furnished with 

 a sliding door (c), laying over 

 the top of the camera when 

 raised. 



Fig. 4- 



