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Show The Mirrors of Antiquity. M. Berthelot has lately interested the French Academy of Sciences In his researches concerning glass mirrors mir-rors which were used in ancient times In Thrace and Egypt. They were backed with a highly polished metal, the nature of which has been in question. ques-tion. M. Berthelot has discovered that the metal was almost pure lead, and he believes that the method of manufacture was to pour the molten Jead on the concave surface of disks cut from balloons of blown glass. In consequence of their shape the mirrors mir-rors minimized the images of objects looked at In them. |