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16 MAKING BETTER MOVIES taken) as it is sent through the camera in the process of making movies. 16mm. film is run through the camera by the same straightaway method that is used in its projec- tion; the same holds true of 9%mm. and 35mm. But con- ceive two 16mm. films run through the same camera side by side, and we have a system analagous to that used in employing 8mm. If the two 16mm. films were then joined together side by side and we had a camera so built that, by running this double film through it, a row of pictures down one side only could be taken, after which a row could be taken down the other side, it is easy to see that a given length of this "double picture" film would contain twice as many pictures as "single picture" film would carry. Now, let us put our imaginary double film under a reduc- ing glass so that its width will appear to shrink to 16mm. The film will still contain a double row of pictures, but each one will be less than 8mm. wide and proportionately high. Here we have the condition that actually obtains in so called 8mm. film, while it is being used in the camera. From our discussion above, we saw that an 8mm. film, bearing a single row of pictures, would contain twice the number of frames in a foot. Hence, a given footage of 8mm. film would last twice as long. But in the camera we employ a double row of pictures, so that a given footage of the unused "double 8mm." film contains not twice, but jour times as many frames as the same footage of unused 16mm. film. This will aid the reader in understanding why the camera equivalent in double 8mm. film, unused, or "Eight film," as it will hereafter be called, is such that a twenty five foot length of "Eight film" is equivalent to a one hundred foot length of 16mm. After the "Eight film" is run through the camera, it is processed, slit in half, lengthwise, and returned to the user as a true 8mm. film, joined end to end consecutively and bearing perforations down one side only. Therefore, when directions for taking