GB637009A - Improvements in or relating to photometers - Google Patents

Improvements in or relating to photometers

Info

Publication number
GB637009A
GB637009A GB1212648A GB1212648A GB637009A GB 637009 A GB637009 A GB 637009A GB 1212648 A GB1212648 A GB 1212648A GB 1212648 A GB1212648 A GB 1212648A GB 637009 A GB637009 A GB 637009A
Authority
GB
United Kingdom
Prior art keywords
eyepiece
directed
cell
filter
wedge
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
GB1212648A
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.)
EARL JUDSON KING
Original Assignee
EARL JUDSON KING
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 EARL JUDSON KING filed Critical EARL JUDSON KING
Priority to GB1212648A priority Critical patent/GB637009A/en
Publication of GB637009A publication Critical patent/GB637009A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/29—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using visual detection
    • G01N21/293—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using visual detection with colour charts, graduated scales or turrets

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

637,009. Photometers. KING, E. J., and KEELER, C. H. May 3, 1948, No. 12126. [Class 97 (i)] A photo-meter, particularly for determining the opacity of specimens, comprises a carrier for the specimen through which a main light beam is directed into an eyepiece and an annular rotatable neutral grey filter wedge graded circumferentially surrounding the main beam, an auxiliary beam being directed through the circumference of the wedge to form an image in the eyepiece adjacent that of the main beam. As shown, the carrier comprises compartments 71, 72, the former holding a cell 74 containing a standard liquid and the latter a cell 75 containing the liquid to be measured. The main beam 61 provided by a diffusing screen 58 illuminated by a lamp 25 passes through the central clear aperture of a filter bridge 79 provided between glass plates 77, 78 and, after passing, the cell 75 is directed by the surfaces 39, 41 of a prism 37 and by a field lens 46 into the eyepiece 29. The auxiliary beam 60 from the lamp passes through the graded filter area of the wedge 79 and after passing through the cell 74 is directed to the eyepiece by the prism 37 and lens 46. The filter is mounted in a ring 82 rotatable in the casing to equalize the brightness of the two images viewed in the eyepiece, the angular position of the ring being read on a suitable scale. Colour filters may be inserted in the eyepiece for measurement over different spectral ranges. The lamp house 62 may be removed and the diffusing screen 58 illuminated by daylight.
GB1212648A 1948-05-03 1948-05-03 Improvements in or relating to photometers Expired GB637009A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1212648A GB637009A (en) 1948-05-03 1948-05-03 Improvements in or relating to photometers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1212648A GB637009A (en) 1948-05-03 1948-05-03 Improvements in or relating to photometers

Publications (1)

Publication Number Publication Date
GB637009A true GB637009A (en) 1950-05-10

Family

ID=9998835

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1212648A Expired GB637009A (en) 1948-05-03 1948-05-03 Improvements in or relating to photometers

Country Status (1)

Country Link
GB (1) GB637009A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850941A (en) * 1955-08-10 1958-09-09 Welch Allyn Inc Device for measuring light transmission

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850941A (en) * 1955-08-10 1958-09-09 Welch Allyn Inc Device for measuring light transmission

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