es so that the flow of sand can be observed. Sand hop- end of the warp-beam and covers the opening in the the eye of the spectator. pers are provided at opposite ends of the box, after other disk containing the coiled spring, to one end of Motion to the wheels is imparted by silent electrical the… … radial ports, the port, K, communicating with one end by the manipulation of corresponding valves, the ar- A STRIKING ILLUSION APPARATUS. of the cylinder, and port, L, with the other, while be- tween them is the exhaust port, ZH. The bottom ‘of means. It is presumable that other devices can be the…
Internet Archive · Public domain (published before 1931). Free to use for anything.
