A SECRET WEAPON FOR HWGACOR

" An experiment which has a drinking water-filled glass sphere was done and al-Farisi showed the extra refractions due to glass may be ignored in his product.[74][c] As he observed in his Kitab Tanqih al-Manazir (The Revision in the Optics), al-Farisi made use of a considerable obvious vessel of glass in the shape of a sphere, which was filled with