GB228354A - Improvements in magnifying lenses - Google Patents

Improvements in magnifying lenses

Info

Publication number
GB228354A
GB228354A GB394924A GB394924A GB228354A GB 228354 A GB228354 A GB 228354A GB 394924 A GB394924 A GB 394924A GB 394924 A GB394924 A GB 394924A GB 228354 A GB228354 A GB 228354A
Authority
GB
United Kingdom
Prior art keywords
lens
lenses
focal length
silvered
mirror
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB394924A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CONRAD JOSEPH BECK
RONALD JOHN BRACEY
Original Assignee
CONRAD JOSEPH BECK
RONALD JOHN BRACEY
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CONRAD JOSEPH BECK, RONALD JOHN BRACEY filed Critical CONRAD JOSEPH BECK
Priority to GB394924A priority Critical patent/GB228354A/en
Publication of GB228354A publication Critical patent/GB228354A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00—Eyepieces; Magnifying glasses
    • G02B25/02—Eyepieces; Magnifying glasses with means for illuminating object viewed

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

228,354. Bracey, R. J., and Bech, C. J. Feb. 15, 1924. Lenses.-An increase of illumination over the portion of an object, under examination with the aid of a magnifying-lens, is effected by combining a mirror and a lens. A positive lens consisting of two or more lenses cemented together has one surface of contact silvered except for an aperture near the centre, to form a reflector. The curves of the lenses are so arranged that the total refracting focal length is approximately equal to the total reflecting focal length. The silvered surface may be other than at rightangles to the line of sight. In a modification a single meniscus lens is used, the radii of curvature being such that the resulting mirror has approximately the same focal length as the lens.
GB394924A 1924-02-15 1924-02-15 Improvements in magnifying lenses Expired GB228354A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB394924A GB228354A (en) 1924-02-15 1924-02-15 Improvements in magnifying lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB394924A GB228354A (en) 1924-02-15 1924-02-15 Improvements in magnifying lenses

Publications (1)

Publication Number Publication Date
GB228354A true GB228354A (en) 1925-02-05

Family

ID=9767908

Family Applications (1)

Application Number Title Priority Date Filing Date
GB394924A Expired GB228354A (en) 1924-02-15 1924-02-15 Improvements in magnifying lenses

Country Status (1)

Country Link
GB (1) GB228354A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453064A (en) * 1945-02-05 1948-11-02 George M Cressaty Magnifying reading unit
US2738700A (en) * 1949-06-20 1956-03-20 Northrop Aircraft Inc Glare-stopped optical system
GB2387920A (en) * 2002-04-24 2003-10-29 Seos Ltd Cemented doublet lens with semireflector for viewing flat image

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453064A (en) * 1945-02-05 1948-11-02 George M Cressaty Magnifying reading unit
US2738700A (en) * 1949-06-20 1956-03-20 Northrop Aircraft Inc Glare-stopped optical system
GB2387920A (en) * 2002-04-24 2003-10-29 Seos Ltd Cemented doublet lens with semireflector for viewing flat image
US6873471B2 (en) 2002-04-24 2005-03-29 Seos Limited Eyepiece for viewing a flat image
GB2387920B (en) * 2002-04-24 2005-11-23 Seos Ltd An eyepiece for viewing a flat image and comprising a cemented doublet of reflecting and refracting optical components

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