Eastman's bromide paper. 
151 
detention will be for a few seconds only, and result in a 
** general post " or sliuflBiing of the whole batch. 
Addenda. 
The ordinary groved tank " plaie-washer " can also be 
used for washing prints most effectively. Plain glass plates, 
or what is still better diaphragms of galvanized wire netting 
(two-inch mesh) are placed in every other gi'ove, and the 
prints to be washed are inserted between them. 
This arrangement is better than the circular trough 
above described for the C quality paper, as the latter is apt 
to float on the siu-face, and in consequence, when several 
sheets are in the trough at one time, they often adhere to each 
other. They can be kept wholly immersed in this " plate- 
washer " by laying a strip of glass about one inch wide across 
the top of the diaphragms. When using a syphon plate- 
washer it is better if the syphon is not allowed to act. This 
can easily be prevented by making a minute air hole in the 
top of the bend of the syphon tube. A steady flow of water 
will then be secured, and the plates or prints will always be 
oovered ; with the syphon at work, they are a great portion, 
of the time out of water. 
