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.

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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
Application number
Inventor
Frederick William Carter
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of GB190008704A publication Critical patent/GB190008704A/en
Expired legal-status Critical Current

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  • 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.
GB190008704D 1900-05-11 1900-05-11 An Apparatus for Facilitating the Photometry of Arc-lamps, and like sources of Light. Expired GB190008704A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5655630A (en) * 1994-08-24 1997-08-12 Shimano, Inc. Bicycle brake device

Cited By (1)

* Cited by examiner, † Cited by third party
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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