GB571111A - Improved means for producing illuminated graticules - Google Patents
Improved means for producing illuminated graticulesInfo
- 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
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.
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)
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 |
-
1943
- 1943-08-18 GB GB1166642A patent/GB571111A/en not_active Expired
Cited By (4)
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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