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Updated: May 24, 2025
There was an extraordinary stroboscopic effect. One of the two starboard propellers, seen through the other, abruptly took on a look which was not that of mistiness at all, but of writhing, gyrating solidity. The peculiar appearance vanished, and came again, and vanished and appeared yet again before it disappeared completely. The jet shot on ahead. Its dive brakes retracted.
Compared with these negative pictures, the positive afterimages are short and they last through any noticeable time only with rather intense illumination. Yet they are evidently sufficient to bridge the interval between the two slits in the stroboscopic disk or in the zoötrope, the interval in which the black paper passes the eye and in which accordingly no new stimulus reaches the nerves.
Yet as the twenty-four slits passed the eye, the twenty-four different positions blended into one continuous jumping movement of the poodle. But this so-called stroboscopic phenomenon, however interesting it was, seemed to offer hardly any difficulty. The friends of the zoötrope surely knew another little plaything, the thaumatrope. Dr. Paris had invented it in 1827.
Uchatius in Vienna constructed an apparatus as early as 1853 to throw these pictures of the stroboscopic disks on the wall. Horner followed with the daedaleum, in which the disk was replaced by a hollow cylinder which had the pictures on the inside and holes to watch them from without while the cylinder was in rotation.
If these little pictures give us the various stages of a movement, for instance a wheel with its spokes in different positions, the whole series of impressions will be combined into the perception of a revolving wheel. Stampfer called them the stroboscopic disks, Plateau the phenakistoscope. The smaller the slits, the sharper the pictures.
He drew the horse race for the zoötrope, but while the horses moved forward, nobody was able to say whether the various pictures of their legs really corresponded to the stages of the actual movements. Thus a true development of the stroboscopic effects appeared dependent upon the fixation of the successive stages.
The problem did not arise with the kinetoscope only but had interested the preceding generations who amused themselves with the phenakistoscope and the stroboscopic disks or the magic cylinder of the zoötrope and bioscope. The child who made his zoötrope revolve and looked through the slits of the black cover in the drum saw through every slit the drawing of a dog in one particular position.
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