r finite variety of figures may be produced. in the direction shown by the arrows, which effectu- will intersect, until finally a beautiful, symmetrical The ring, which revolves on the plate, is recessed network of lines will be formed. ally dries the sand, and carries along with it all the around… … focus, appears to stand out several inches from the between the sand and the steam jet, but immediately screen, and seems to float in the air. the foot is removed from the lever this connection Fig. 2.-TRACINGS PRODUCED BY THE CYCLOIDOTROPE. Another interesting optical illusion is noticed when, is…
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