Show the th mirror of antiquity M berthelot Derth elot has haa lately interested the french academy ot of sciences in hla bis ie lescar searches ches concerning glass mer mfr rora which were used in ancient times in thrace and egypt they were backed with a highly polished metal the nature of which has been cinques in abos tion if Derth berthelot elot has discovered that the metal was almost pure lead al and nd he believes that the method of manufacture was to pour the molten lead on the concave surface of disks cut from balloons of blon glass in consequence of their shape the mirrors minimized the images of objects looked at in them |