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    Improvements in Bi-focal Lenses.
    2.
    发明专利
    Improvements in Bi-focal Lenses. 未知

    公开(公告)号：GB191311375A

    公开(公告)日：1913-07-10

    申请号：GB191311375D

    申请日：1913-05-15

    Applicant: CROSS ANDREW JAY

    Inventor： CROSS ANDREW JAY

    IPC: G02C7/06

    Abstract: 11,375. Cross, A. J. May 15. Spectacle lenses.-A bifocal lens is made from two members of the same contour, the shortdistance-member 11 being complete and the longdistance component 12 being cut away so that the member 11 is used by itself for reading &c. The two parts are cemented together and further held by straps 14, 15.

    Improvements in Multi-focal Lenses.
    3.
    发明专利
    Improvements in Multi-focal Lenses. 未知

    公开(公告)号：GB191417820A

    公开(公告)日：1915-03-18

    申请号：GB191417820D

    申请日：1914-07-28

    Applicant: CROSS ANDREW JAY

    Inventor： CROSS ANDREW JAY

    IPC: G02C7/06

    Abstract: 17,820. Cross, A. J. July 28. Spectacle lenses. - In multi-focal spectacle lenses, the optical axes 5, 6 of the minor segments 2, 3 pass through the middle points of the inner edges of such segments and are decentred with respect to the axis 4 of the principal lens 1. The principal lens may have two or more minor lenses superposed upon it in this way.

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