106 ARRANGEMENT OP APPARATUS, ETC. 



tensity of the light is insufficient and the position of 

 the camera unsuitable for wet plates. 



The dark slide is examined; the side on which the 

 plates are inserted opened, and placed with the zinc 

 and velvet partitions, on some dry support. 



The door of the dark room being securely fastened 

 and the curtain drawn across it, the tin cover is 

 placed over the lamp. 



The tin box containing the packages of dry plates 

 is now opened ; the lid should fall back to a hori- 

 zontal position, thus forming a shelf on which the 

 pasteboard box and cover can be placed during the 

 removal of the desired number from it. As we are 

 now using a double dry slide, two are, removed, 

 and held one above the other by their edges be- 

 tween the thumb and finger of the left hand, with 

 the right we replace the cover on the cardboard box 

 containing the remaining plates, shut the tin box, 

 and if necessary, cover it with a dark cloth kept for 

 the purpose. 



Holding the plates in our left hand, we go to the 

 support on which the dark slide has been placed, 

 and insert one plate with the gelatine surface down- 

 wards or looking towards the unopened side. The 

 gelatinised surface may be distinguished from the 

 other, by its want of lustre, when reflecting the 

 image of the lamp ; care being taken to use only 

 sufficient light to enable us to barely distinguish the 

 difference. One zinc partition is placed with its 

 velvet side next the back of the plate, the other 

 with it in the opposite direction. The second plate 



