ENLARGING ON BROMIDE PAPER. 
149 
rapid paper may be used. The exposure should be so 
regulated that the prints develop slowly, free from fog 
and from greenness. It is impossible to lay down the 
time of exposure, or even to give useful hints, as all 
depends on the light, the negative, and the emulsion. 
When the condenser is used in the lantern the exposure 
required will be very short, unless the lens is well 
stopped down. It is to be noted that the diaphragms 
of photographic lenses are usually so arranged that each 
one necessitates double the exposure required with the 
next larger diaphragm. There is very little gain, in 
enlarging, by using small stops, but sometimes the 
exposure with the largest stops is inconveniently short; 
this is often found with a condenser and extra-rapid 
bromide paper. 
The operations of development, fixing, washing, etc., 
are the same as given in Chapter XIV. 
As illuminant, in enlarging with a condenser, we 
may use an oil lamp or limelight. A Welsbach burner 
answers admirably, and is generally used by the writer; 
acetylene burners are probably even better, but not so 
convenient to use. 
