The Eastman paper films for the roll-holder are prepared in continuous bands, and are rolled up on wooden spools and neatly packed in paper boxes.

The spool may be removed from its box and placed in the holder in daylight, at the expense of the outside roll or length of paper necessary to extend from the spool to the winding-reel, so that if one were so situated as to find it necessary to change rolls in the field, the loss would be trifling - being at the utmost not more than would be required for two exposures from each spool.

The proper course, however, is to charge the holder with its spool of film in the dark room before going abroad.

In doing this it is necessary that the light in the room should be strong enough to enable the operator to see comfortably; but of such a quality as not to injure the paper, which is at least 25 per cent, more sensitive than the same emulsion would be if on glass instead of paper.

Figure 1 gives a general idea of the shape of the holder, with the slide partly drawn to show a portion of the film. Also may be seen the brass loops or clamps which hold the cover securely over the working parts, and the key at the bottom which turns the reel to which the loose end of the paper is attached.

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Fig. 1.

The working parts are fastened to a light metal frame, and consist of a spool of film at the right end, and the winding reel at the left, as seen in Figure 2. Both the spool and the reel are provided with spring brakes, that prevent the uncoiling or unrolling of the paper from either the spool or reel. The milled heads of the chucks which hold the near ends of the spool and reel are provided with pawls, which, while permitting them to turn easily in the right direction, prevent the possibility of turning the other way.

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Fig. 2.

When the cover, as seen in Fig. 2, is to be removed, the keyhole guard and the indicator knob are pulled out as far as they will come, the two loops on each side are turned down, the cover lifted off, leaving the working parts exposed, attached to the back of the holder by spring bolts, two at each end of the frame. Now, with the thumb and fore-finger of the right hand, press these bolts, and thus release the right end of the framework, which you may turn up, as seen in Fig. 3, which is the position for removing and replacing the roll of film.

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Fig. 3.

The proper method of doing this is more particularly shown in Fig. 4. With the left hand you hold the roll of film and draw back the spring brake; nowpress the end of the roller that has the saw-cut or groove across it against the chuck, as seen on the left, while the right hand unscrews the pivot or support for the other end of the roller, which is then placed in position; the pivot is inserted and screwed home.

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Fig. 4.

This completes the operation of placing the roll of film in position. The frame is then turned down and secured by the two bolts, the paper band on the roll of film is torn off, and the end of the film is carried beneath the guide roller and over it and across the exposing table to the other end, which is next released and raised to a perpendicular position. The end of the film is now brought over the guide roller and attached to the winding reel, as shown in Fig. 5.

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Fig. 5.

The paper is fastened to the winding reel by a metallic clamp, which is pivoted to the ends of the winding reel. Now see that the film occupies a central position across the table and over the guide rolls, and then take up the slack by means of the milled head tension screw or chuck at one end of the reel. The pawls should now be adjusted on the milled heads of the chucks, the cover replaced and fastened by raising the loops or clamps over the pins in the side of the cover, and you are ready for work.

For the purpose of indicating plainly where the first exposure will be, insert the key and screw it home then turn it slowly until you hear a sharp click, then pull out the slide and draw a pencil across the film at each end of the holder, then return the slide.

When about to make another exposure, note the position of the indicator at the right end of the holder, then turn the key slowly; the proper length will be indicated both by the sound of the sharp click within and by the position of the indicator on the outside of the holder. At every turn of the guide-roll the paper is punctured by a sharp point which occurs simultaneously with the sound of the click. For the smaller sizes, three clicks and three punctures will surely indicate that the proper length of paper has been replaced on the exposing table. For the medium sizes four clicks and punctures are required. And for the larger sizes, as many as six or eight may be necessary. The proper information is given with the holder.

When the exposures are made, and it is desired to remove the paper from the winding reel and cut it for development, proceed as before, and remove the cover from the holder; then, with a sharp knife-blade, cut the paper, as shown in Fig. 6, by drawing the blade over the paper and in the tin-lined groove in the guide-roll. Then release the spring pawl at the reel end and draw the paper from the reel across the table, then cut by measurement, or by counting the punctures.

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Fig. 6.

The directions for developing and preparing the films for printing accompany each package of the paper.