The slowest speed at which it has been found practicable to project a series of images having ordinary motion, as of actors walking, and to smooth out the jerkiness which would be expected by the step-by-step nature of the projection when the persistence-of-vision method is used, is about fourteen pictures per second. Fourteen pictures are to be projected each second, and with uniformity.
The running time of a full 1000-foot reel he says is about 20 minutes. He also describes early sound film processes and Kinemacolor projection, which were run faster -- almost 18 fps (for 15 minutes per reel) and 32 fps (for about 8 minutes per reel), which he notes require specially-built projectors that can handle the speed without damaging the film, as well as electric motors because it would be too much work for an operator to hand-crank an entire reel at that rate.
Of course shooting rates and projection rates gradually increased every year, especially the next few years following that book's publication, but a 1907 live-action film should probably be run somewhere between 12 and 18 fps, with 15 fps being a good compromise rate to start with. Comedies would probably be better to run at a slightly faster rate than serious dramas or newsreels. Early animated films, I've noticed, tend to look better between 18 and 24 fps, probably because it was too much work to draw all the individual fractions of a second and the drawings were each filmed for two or three frames with six to twelve drawings per second.
