GB190008704A - An Apparatus for Facilitating the Photometry of Arc-lamps, and like sources of Light. - Google Patents
An Apparatus for Facilitating the Photometry of Arc-lamps, and like sources of Light.Info
- Publication number
- GB190008704A GB190008704A GB190008704DA GB190008704A GB 190008704 A GB190008704 A GB 190008704A GB 190008704D A GB190008704D A GB 190008704DA GB 190008704 A GB190008704 A GB 190008704A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mirror
- arm
- light
- tube
- mirrors
- 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
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
8704. Carter, F. W. May 11. Photometers.-The instrument is for comparing the light emanating from arc lamps &c. in various directions. This is done by a sliding photometer head P which compares the light received from the lamp L through a funnel S, having a translucent plate at the bottom and a mirror M<4> for directing the rays to the head P, with the light received in any direction after three reflections from the mirrors M<1>, M<2>, M<3>. To vary the direction, the mirror M<1> is carried on an arm C D turning about an axis and having a pointer to facilitate adjustment. The mirror is set at an angle of 45‹ to both C D and D M'. The mirrors M<2>, M<3> are similarly mounted, except that tubes carrying them can slide longitudinally and turn the former in the arm E F, which is equal to C D, and the latter in the bearing G. The tubes are connected by a rod H K and by an inextensible cord F H K G passing through guide-rings. The rod H K is fixed to the tube carrying the mirror M<2>, and slides through a tube at right-angles to and turning with the tube carrying the mirror M<3>. By the arrangement described, when the arm E F is set parallel to C D the ray is reflected along the required path, and, the cord being kept taut, the length of its path will remain constant for all parallel positions of the arms C D and E F.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB190008704T | 1900-05-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB190008704A true GB190008704A (en) | 1900-07-21 |
Family
ID=32618467
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB190008704D Expired GB190008704A (en) | 1900-05-11 | 1900-05-11 | An Apparatus for Facilitating the Photometry of Arc-lamps, and like sources of Light. |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB190008704A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5655630A (en) * | 1994-08-24 | 1997-08-12 | Shimano, Inc. | Bicycle brake device |
-
1900
- 1900-05-11 GB GB190008704D patent/GB190008704A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5655630A (en) * | 1994-08-24 | 1997-08-12 | Shimano, Inc. | Bicycle brake device |
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