CHAPTER XV. 
ENLARGING ON BROMIDE PAPER. 
T T is frequently desirable to produce prints of larger 
size than the three-inch circle which has been 
taken as the standard size for negatives ; and where 
mere magnification, and not resolution, is desired, it 
will be found more convenient in most cases to make 
an enlarged print from an ordinary negative than to 
make a negative of unusual size. The process of 
enlarging is quite simple, and most workers possess all 
the requisite apparatus ; if not, it is by no means costly 
or complicated. 
The original negative requires, in the first place, to 
be evenly and strongly illuminated ; this may be done 
by daylight from the sky, or diffused by a sheet of 
ground-glass. Or it may be accomplished by an arti¬ 
ficial light and a condenser such as is used in an optical 
lantern ; for our three-inch circle, the ordinary lantern 
condenser of four inches diameter answers well. We 
next require a photographic lens to project the enlarged 
image on to our sensitive surface, which must be kept 
parallel to the negative. And lastly, we require to 
