. Spectacles and eyeglasses, their forms, mounting, and proper adjustment . part, and such glasses may sometimes be mounted inthis way with advantage. In a third form, called frame-less spectacles (Fig. 6), the wire encircling the glass isdispensed with altogether, small holes being drilled throughthe glass near its edge for the accommodation of screwswhich fasten the bridge and temples in place. The advan-tages of this form are its beauty and should never be prescribed for children, as it is quite GENERAL CONSIDERATIONS. 23 liable to break at the point where the glass has
. Spectacles and eyeglasses, their forms, mounting, and proper adjustment . part, and such glasses may sometimes be mounted inthis way with advantage. In a third form, called frame-less spectacles (Fig. 6), the wire encircling the glass isdispensed with altogether, small holes being drilled throughthe glass near its edge for the accommodation of screwswhich fasten the bridge and temples in place. The advan-tages of this form are its beauty and should never be prescribed for children, as it is quite GENERAL CONSIDERATIONS. 23 liable to break at the point where the glass has been edges of these glasses should not be polished, butshould be given a dull finish, otherwise they reflect the lightdisagreeably. Sides, or temples, have been variously having sliding and turn-pin joints are examples ofantiquated forms. Those now used are the hook, orriding-bow, and the plain, straight temple. Theformer are to be preferred in all cases where the glassesare to be worn constantly or nearly so, and the latter for Fig. X, K, Curl, and Saddle Bridges. those who wear glasses for near work only, and require toremove them frequently from the eyes. Hook temples aremade in three lengths, designated as short, medium, andlong. These are sufficient for all cases. Securing a proper fit in the bridge, upon which so muchof the comfort and efficiency of spectacles depends, was adifficult matter until the ingenuity of Dr. Charles HermonThomas, of this city, suggested what is known as thesaddle bridge, which solved the problem. (See Fig. 7.)This bridge may be varied to suit every possible case, and 24 SPECTACLES AND EYEGLASSES, is always to be preferred. The K bridge., formed ofwires in the shape of the letter K, is allowable in somecases. The nearly similar X bridge allows the glassesto teeter, or see-saw across the nose, with the motions ofthe head. It is. however, the best form of bridge for re-versible glasses; that is. glasses for persons
Size: 2033px × 1229px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjecteyeglasses, bookyear1
