THE GOLD FISH APPEAR AND DISAPPEAR AT THE TOU A PUZZLING DISPLAY BOX. BY FRANK C. PERKINS. INTO THE OTHER. A TRICK WITH TOURMALINE. RICA STATE COLLEGE. SECTIONAL PLAN VIEW OF THE ILLUSION BOX The invisible printing Is read easily through what appears to be common green glass. A TRICK WITH TOURMALINE., scientific american, 1908-11-28
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