This section is from the book "Complete Self-Instructing Library Of Practical Photography", by J. B. Schriever. Also available from Amazon: Complete Self-Instructing Library Of Practical Photography.
Making The Enlargement. First place the film or glass negative in the negative holder, with the face or dull side towards the lens, and attach the holder securely to the narrow end of the box or camera. Next, attach the paper holder containing the sensitive paper to the large end of the camera. With the Brownie and Ingento No. 1 cameras the entire box will have to be taken into the darkroom for loading. With the Ingento No. 2 and the Kodak
No. 1 this is not necessary; all you require is to take the paper holder into the dark-room, and this holder can be attached to the camera in daylight the same as on any camera. When you are ready to make the exposure you draw the slide just the same as you would from a plate holder, and after the exposure is made the slide is again inserted, thus protecting the paper from the light, when the holder may be taken to the dark-room and the exposed paper developed.
Focusing. The Brownie and Ingento enlarging boxes require no adjusting whatever, as they are fixed focus cameras, while the Kodak No. 1 is so constructed that by extending both the front and rear bellows to certain points indicated by pointers on the camera bed, you will obtain the largest image possible to make with this camera. When one desires to enlarge only a portion of a negative, which requires more accurate focusing, then focusing must be done on the ground-glass. The lens should be used wide open when focusing. The rear section of the bellows gives you the size of the image. The further the bed is extended the greater will be the size of the enlargement. When you have the bed in position to give the desired size enlargement, clamp it fast, and then focus for sharpness by sliding the support for the lens board back and forth until the image on the ground-glass is as sharp as it is possible to obtain with the large stop; then insert a small stop, which gives you good sharpness throughout, and close the shutter when you are ready for the exposure.
Placing The Camera For The Exposure. In making the exposure it is important that the negative be evenly illuminated, and that it receive as strong a light as possible, but not direct sunlight. Placing the camera on an ordinary table, near a window, with the negative end facing the light, will answer, providing the window is not obstructed by buildings or trees. With the fixed focus enlarging camera, such as the Brownie or Ingento No. 1, if desired the enlarging camera may be placed out doors, set on end in a place where it is shielded from direct sunlight, with the end containing the negative directed towards the sky.
Illustration No. 65 Illuminating the Negative.
See Paragraph No. 568
568. Where the window is used, and should there be any obstructions outside, an even illumination may be obtained by placing the camera on a table beside the window, the camera and window being parallel. Provide a piece of white cardboard about 14 x 20 inches, and place it about a foot from the negative, at an angle so as to reflect the light from the window onto the negative (See Illus. No. 65).