GB704150A - Improvements in and relating to optical systems for galvanometers and the like - Google Patents

Improvements in and relating to optical systems for galvanometers and the like

Info

Publication number
GB704150A
GB704150A GB2321950A GB2321950A GB704150A GB 704150 A GB704150 A GB 704150A GB 2321950 A GB2321950 A GB 2321950A GB 2321950 A GB2321950 A GB 2321950A GB 704150 A GB704150 A GB 704150A
Authority
GB
United Kingdom
Prior art keywords
scale
mirror
image
instrument
cylindrical
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
GB2321950A
Inventor
Edmund Ramsay Wigan
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.)
British Broadcasting Corp
Original Assignee
British Broadcasting Corp
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 British Broadcasting Corp filed Critical British Broadcasting Corp
Priority to GB2321950A priority Critical patent/GB704150A/en
Publication of GB704150A publication Critical patent/GB704150A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D7/00—Indicating measured values

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Measuring Devices (AREA)

Abstract

704,150. Indicating-apparatus. BRITISH BROADCASTING CORPORATION. Sept. 21, 1951 [Sept. 21, 1950], No. 23219/50. Class 106 (4). [Also in Group XX] In a galvanometer or like instrument in which readings are taken by means of an image of an illuminated object formed on a scale by an optical system after reflection by a rotary reflecting portion of the instrument, a concave spherical or cylindrical mirror is disposed in the optical path between the rotary reflector and the scale and is so dimensioned that its radius of curvature is greater than that of the focus of the real image which would be formed by the optical system and the reflector were the mirror absent. As shown light from a source 1 illuminates by a condenser 3, or slot 2, light from which is projected by a lens 6 on to a plane mirror 4 rotatable about an axis 5, and thence passes to a concave cylindrical mirror 8 which forms an image of the slot 2 on a cylindrical scale 10 forming one wall of the casing 12 of the instrument. The cylinder axes of the mirror 8 and scale 10 are parallel, and co-planar with the axis 5 which, in a modification, may also be parallel to the said cylinder axes. The scale may be flat or convex and data for the dimensions of various modifications are given in which, for a particular viewing distance, the image appears equally bright at all positions on the scale.
GB2321950A 1950-09-21 1950-09-21 Improvements in and relating to optical systems for galvanometers and the like Expired GB704150A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2321950A GB704150A (en) 1950-09-21 1950-09-21 Improvements in and relating to optical systems for galvanometers and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2321950A GB704150A (en) 1950-09-21 1950-09-21 Improvements in and relating to optical systems for galvanometers and the like

Publications (1)

Publication Number Publication Date
GB704150A true GB704150A (en) 1954-02-17

Family

ID=10192086

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2321950A Expired GB704150A (en) 1950-09-21 1950-09-21 Improvements in and relating to optical systems for galvanometers and the like

Country Status (1)

Country Link
GB (1) GB704150A (en)

Similar Documents

Publication Publication Date Title
KR790000468B1 (en) Method of optical reflection for adjusting lens
GB1211023A (en) A system for determining the displacement of an object from a line of sight
GB1266971A (en)
KR840000789A (en) Gun sight
GB1420165A (en) Optical systems
GB704150A (en) Improvements in and relating to optical systems for galvanometers and the like
GB1486485A (en) Comparison microscope
GB1119519A (en) Improvements relating to comparison photometers
GB862734A (en) A prism combination for altering the light path through a camera-microscope
US3114284A (en) Optical system for projection of scale means
GB1455029A (en) Apparatus for checking the line of sight of a telescope in relation to that of an infra-red goniometer
US2684011A (en) Method and apparatus for measuring angles between reflecting surfaces
GB1109172A (en) Telescopic direction-finding apparatus
GB698641A (en) Improvements in or relating to microscopes and illuminating systems therefor
GB1286421A (en) Optical device for testing alignment and direction
US2479343A (en) Optical image projector for variable indicating devices
GB963094A (en) Improvements in or relating to ophthalmometers
GB674193A (en) Improvements in or relating to optical comparators
GB865361A (en) Improvements in optical apparatus for testing the human eye
GB1286598A (en) Optical device for examining profile or roughness of a surface of a specimen by an optical intersection method
GB731759A (en) Improvements in and relating to reflection sights
GB751149A (en) Optical imaging system especially for a measuring microscope
GB700573A (en) A device for verifying optically projected images
GB898007A (en) Improvements in or relating to optical magnifying systems
GB812968A (en) Improvements in and relating to optical systems