Page 99 - The Wellington photographic handbook

If a small negative is fixed so that it is evenly illuminated from
behind, and we have a camera sufficiently large and capable of
extending far enough, it will be possible to set such a camera in front
of the negative, focus to the required size, and then using a piece
of bromide paper instead of a plate, make a photograph of the
negative. On development this will be found to be a positive
print, just like a contact print of the same negative, only of a
larger size. This is enlarging in its simplest form. But as, in
order to get an enlarged picture, the lens of the camera must be
nearer to the object—i.e., the original negative—than the bromide
paper is to the lens, and as the latter distance may have to be
several times the focus of the lens, the extension required is so
great that it is not usually convenient to employ a camera of the
ordinary type and therefore some form of special apparatus is used.

ENLARGING BY DAYLIGHT.
The method which requires the least quantity of special
apparatus is one in which the work-room itself becomes the camera,
as shown in the sketch below.
The window of the work-room has been blocked up with an
opaque shutter, so that no light can enter except through the

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