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… … vides means for readily lowering or raising the tone radial ports, the port, K, communicating with one end by the manipulation of corresponding valves, the ar- A STEIKING ILLUSION APPAEATUS. of the cylinder, and port, L, with the other, while be- tween them is the exhaust port, E. The bottom of…
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