GB137962A - Improvements in lenses - Google Patents

Improvements in lenses

Info

Publication number
GB137962A
GB137962A GB748419A GB748419A GB137962A GB 137962 A GB137962 A GB 137962A GB 748419 A GB748419 A GB 748419A GB 748419 A GB748419 A GB 748419A GB 137962 A GB137962 A GB 137962A
Authority
GB
United Kingdom
Prior art keywords
lens
zones
principal
parts
behind
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
GB748419A
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.)
Corning Glass Works
Original Assignee
Corning Glass Works
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 Corning Glass Works filed Critical Corning Glass Works
Priority to GB748419A priority Critical patent/GB137962A/en
Publication of GB137962A publication Critical patent/GB137962A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
    • B61L5/12—Visible signals
    • B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
    • B61L5/1809—Daylight signals
    • B61L5/1845—Optical systems, lenses

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

137,962. Haddan, A.J. H., (Corning Glass Works). March 25, 1919. Lenses.-A signalling-lens is formed with a series of refracting-zones, the principal focal points of the zones on one part of it being substantially the same for all the zones in such parts, and the principal focal points of the zones on one or more other parts being behind those of the first part and different from one another. The lens may be used for railway signalling, the first part being the upper part of the lens, extending to 135 degrees each side of the vertical, and producing, when the light source is at its principal focus, a parallel beam for distant observation. The lower part of the lens may comprise zones having focal points B - - B<4>, Fig. 4, behind the focal point A of the upper part, and producing downwardly-deflected diverging beams which overlap and are visible at close quarters. A plurality of parts as last described may be provided; in the case of a railwaysignal lens, a side part of the lens may have an inner zone with its principal focus at A and the foci of the other zones at various distances behind A.
GB748419A 1919-03-25 1919-03-25 Improvements in lenses Expired GB137962A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB748419A GB137962A (en) 1919-03-25 1919-03-25 Improvements in lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB748419A GB137962A (en) 1919-03-25 1919-03-25 Improvements in lenses

Publications (1)

Publication Number Publication Date
GB137962A true GB137962A (en) 1920-01-29

Family

ID=9833993

Family Applications (1)

Application Number Title Priority Date Filing Date
GB748419A Expired GB137962A (en) 1919-03-25 1919-03-25 Improvements in lenses

Country Status (1)

Country Link
GB (1) GB137962A (en)

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