Scientific amusements . Top for experiments demonstrating Newtons tlieory of the mingling of colours. put underneath ; we then pull the string firmly withthe right hand, and when the top is in motion it isseparated from the clamps. By pulling the string verypowerfully it is possible to obtain a speed of sixty turnsin a second, and the movement will be kept up for threequarters of an hour. Besides tops, we may make use of different kinds ofdiscs, with an axis rotating between two clamps ; they THE PHENAKISTOSCOPE. 6} are moved either by a kind of clock-work, or by theunrolling of a string, like
Scientific amusements . Top for experiments demonstrating Newtons tlieory of the mingling of colours. put underneath ; we then pull the string firmly withthe right hand, and when the top is in motion it isseparated from the clamps. By pulling the string verypowerfully it is possible to obtain a speed of sixty turnsin a second, and the movement will be kept up for threequarters of an hour. Besides tops, we may make use of different kinds ofdiscs, with an axis rotating between two clamps ; they THE PHENAKISTOSCOPE. 6} are moved either by a kind of clock-work, or by theunrolling of a string, like the tops. Generally, however,these contrivances have this inconvenience, that the discscannot be changed without stopping the instrument, andpartly taking it to pieces. On the other hand, we havethe advantage of being able to turn them on a verticalplane, so that we can conveniently carry on our experi-ments before a numerous auditory, which is a more diffi-cult matter with tops. Montigny contrived to obtain theminglin
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
