GB571111A - Improved means for producing illuminated graticules - Google Patents

Improved means for producing illuminated graticules

Info

Publication number
GB571111A
GB571111A GB1166642A GB1166642A GB571111A GB 571111 A GB571111 A GB 571111A GB 1166642 A GB1166642 A GB 1166642A GB 1166642 A GB1166642 A GB 1166642A GB 571111 A GB571111 A GB 571111A
Authority
GB
United Kingdom
Prior art keywords
cap
aperture
envelope
spot
graticule
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
GB1166642A
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.)
FIDELITY ENGINEERING Co L
Original Assignee
FIDELITY ENGINEERING Co L
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 FIDELITY ENGINEERING Co L filed Critical FIDELITY ENGINEERING Co L
Priority to GB1166642A priority Critical patent/GB571111A/en
Publication of GB571111A publication Critical patent/GB571111A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/32—Fiducial marks and measuring scales within the optical system
    • G02B27/34—Fiducial marks and measuring scales within the optical system illuminated
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/64—Cathode glow lamps

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

571,111. Optical apparatus. FIDELITY ENGINEERING CO., Ltd., and CROWTHER, F. K. Aug. 18, 1943, No. 11666/42. [Class 97 (i)] [Also in Group XL] A gas discharge lamp for forming an illuminated graticule comprises an outer envelope having a flat transparent end wall A, an inner envelope dividing the space into outer and inner compartments B, C, and a hole or restricted passage in the end wall of the inner envelope adjacent the flat end of the outer envelope which forms a glowing graticule by reason of the glow discharge passing through it between electrodes E, F in the compartments. In the lamp shown the inner envelope is formed by a tubular wall Q on which fits a cap K of insulating material such as porcelain. In the top surface of the cap is a circular groove M communicating by an aperture O with the outer compartment and by a passage N with a central aperture D leading to the inner compartment. The glow in the groove M and aperture D provides a graticule in the form of a nearly complete circle with a central spot. A disc L of glass, quartz, mica or other suitable material covers the top surface of the cap. In another form, providing only a glowing spot, the electrode E is situated in a recess in the top of the cap K, around a central aperture in which the spot is formed. To eliminate halo an opaque diaphragm is provided having in it a hole of the desired shape and size above the aperture in the cap.
GB1166642A 1943-08-18 1943-08-18 Improved means for producing illuminated graticules Expired GB571111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1166642A GB571111A (en) 1943-08-18 1943-08-18 Improved means for producing illuminated graticules

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1166642A GB571111A (en) 1943-08-18 1943-08-18 Improved means for producing illuminated graticules

Publications (1)

Publication Number Publication Date
GB571111A true GB571111A (en) 1945-08-08

Family

ID=9990449

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1166642A Expired GB571111A (en) 1943-08-18 1943-08-18 Improved means for producing illuminated graticules

Country Status (1)

Country Link
GB (1) GB571111A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1127103B (en) * 1959-08-06 1962-04-05 Electronique & Physique Optical sighting device for television cameras or optical observation devices
GB2198580A (en) * 1986-10-31 1988-06-15 Toshiba Kk Fluorescent lamp generating different colour light beams

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1127103B (en) * 1959-08-06 1962-04-05 Electronique & Physique Optical sighting device for television cameras or optical observation devices
GB2198580A (en) * 1986-10-31 1988-06-15 Toshiba Kk Fluorescent lamp generating different colour light beams
US4835440A (en) * 1986-10-31 1989-05-30 Kabushiki Kaisha Toshiba Fluorescent lamp generating different color light beams
GB2198580B (en) * 1986-10-31 1990-05-02 Toshiba Kk Fluorescent lamp generating different colour light beams

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