Show The Mirrors of Antiquity M. M Berthelot has lately Interested the French Academy of Sciences In his lila researches concerning glass mirrors mir mir- fors which were used In ancient times Umes in in Thrace and Egypt They were 44 i backed with a highly polished metal ii the nature of which has been In ques ques- tion M. M Berthelot has discovered that the metal was almost pure lead and he believes that the method of manufacture was to pour the molten lead on the concave surface of disks cut from balloons of blown glass In Inconsequence consequence of their shape the mirrors mirrors mir mir- tors minimized the Images of ot objects looked at In them |