. Spectacles and eyeglasses, their forms, mounting, and proper adjustment . while in this position, the loops of the spiral will retain theshape given them. A single cut down the side of thecylinder converts each loop into a separate oval ring. Endpieces and straight temples are stamped from sheets ofmetal, and afterward formed and tempered. Hooktemples of steel are turned from wire upon a lathe. Bridgesare usually made of oval or half-oval wire, and are simplypressed to the desired shape by a forming machine. Of the Different Patterns of Spectacles.—In the com-mon and strongest form of specta
. Spectacles and eyeglasses, their forms, mounting, and proper adjustment . while in this position, the loops of the spiral will retain theshape given them. A single cut down the side of thecylinder converts each loop into a separate oval ring. Endpieces and straight temples are stamped from sheets ofmetal, and afterward formed and tempered. Hooktemples of steel are turned from wire upon a lathe. Bridgesare usually made of oval or half-oval wire, and are simplypressed to the desired shape by a forming machine. Of the Different Patterns of Spectacles.—In the com-mon and strongest form of spectacle, the edge of the glass 2 2 SPECTACLES AND EYEGLASSES. is beveled, so as to enter a groove in the wire which sur-rounds it. In a second form, in which the edge of the glassis grooved for the reception of a fine, round wire, the objectsought, of rendering the rim of the spectacles less conspicu-ous, is generally defeated by the fact that the glass must bemade thicker than it otherwise need be, in order to giveroom for the groove on its edge. In concave glasses thisis
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecteyeglasses, bookyear1
