ns ground to the section of a cylinder and the other —five hours for each grinding and seven for the pol- sands of pairs of shells and blocks used for spectacle- side to the section of a sphere, obviously cannot be ishing. lens grinding alone, he stops to wonder at the science made periscopic if… … glass. These two curvatures have working out the last tiny abrasive Centering the lens. This operation is highly important $ for on the ink spot placed on the effect of a sphero-cylindrical mark and leaving the lens with a the center of the lens depend the mechanical and optical properties of the…
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