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.
Daylight Loading Films. Daylight loading spool films, as the name implies, can be loaded into the camera in daylight. The operation should be carried on in subdued light, and not in bright sunlight, however. Spool films are made in all sizes to fit all sizes of cameras, and are of varying lengths, providing sufficient film for four exposures (called double two exposures), six exposures and twelve exposures, except with certain kinds of cameras, such as the Panoram, with which the number of exposures to the spool is not so great. At the back or side of your film camera are receptacles for the spool of film, and an empty spool on which to wind the film. The blank spool should be set in the space or receptacle that is regulated by the winding key on the outside of the kodak. Now, break the gummed slip that holds down the end of the black paper on the spool containing the unexposed film, and insert this spool in the other receptacle.
174. In most of the box type of kodaks, the end of the black paper is next passed across the opening in the back of the roll holder and under the pasteboard flap, and threaded through the slit in the empty reel. Be careful to have the paper draw straight and true, then give the spool two or three forward turns (to the left from the key end). With the folding types of kodaks simply draw the end of the black paper across the back of the camera and insert it in the blank spool.
Important. Be sure that the paper rolls from the outer side of the spool. Since each spool is marked "top" on one end, when inserting look for the mark and be guided accordingly. Should you insert the film spool wrong, the black paper backing would come between the film and the lens, thereby making the exposure upon the paper in place of the film, and when removing from the camera the film not being protected by the paper, the result will be a complete loss of the roll of film. The winding spool has a slot in one end, into which fits the flange of the winding key.
176. CAUTION. If you reel off too much of the black paper, before the camera is closed, the film will be uncovered and, of course, ruined. Be sure your camera is closed perfectly before unwinding the film.
177. After the kodak is closed, turn the key to the left, until the number 1 appears before the little red window in the back of the camera. The film is now in position for taking the first picture.
Double-Two Film. We recommend what is known as the "double-two" films, as they are more convenient for your experiments. If you were to employ the six or twelve exposure films, there would be a loss of film as well as of time. This double-two film is for four exposures, and is so arranged that, after two exposures have been made, you can cut off the exposed film without any danger of fogging the two remaining ones. This is done by turning the black paper, which separates exposures 1 and 2 from 3 and 4, until the letter S (indicating Stop) appears at the little red window, which indicates the number of the exposure.
179. Now open your camera and cut the black paper where it is marked "cut here." Then insert the empty spool, saved from former exposed rolls, in place of the spool just removed. Attach the end of the black paper to this spool and proceed to load your kodak in the same manner as at first. Attach the end of the paper to the spool, close the camera and wind the film, until No. 3 shows, when you are ready for the third exposure. After you have made exposure No. 4, and previous to opening the camera to remove the film, be sure to wind the strip of black paper around the film. Wind until you hear the click of the paper being released from the other spool. If you cannot secure the "double-two" films, get the six exposure films. They can be obtained from any dealer in photographic supplies.