GB257127A - Improvements in and relating to refractometers - Google Patents

Improvements in and relating to refractometers

Info

Publication number
GB257127A
GB257127A GB2734525A GB2734525A GB257127A GB 257127 A GB257127 A GB 257127A GB 2734525 A GB2734525 A GB 2734525A GB 2734525 A GB2734525 A GB 2734525A GB 257127 A GB257127 A GB 257127A
Authority
GB
United Kingdom
Prior art keywords
refractive index
hemisphere
casing
optical
refractometers
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
GB2734525A
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.)
RAYNER OPTICAL Co Ltd
Original Assignee
RAYNER OPTICAL Co Ltd
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 RAYNER OPTICAL Co Ltd filed Critical RAYNER OPTICAL Co Ltd
Priority to GB2734525A priority Critical patent/GB257127A/en
Publication of GB257127A publication Critical patent/GB257127A/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
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
    • G01N21/43—Refractivity; Phase-affecting properties, e.g. optical path length by measuring critical angle

Landscapes

  • Physics & Mathematics (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)
  • Eye Examination Apparatus (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

257,127. Tully, B. J., and Rayner Optical Co., Ltd. Oct. 30, 1925. Refractometers.-A refractometer for the determination of the refractive index of precious stones, consists of a. hemisphere 1 of glass having a high refractive index and carried in a rotatable disc 2 in a casing 3 with its flat face horizontal. It is illuminated by light reflected from a mirror 9 and is viewed by an eye-piece 23 through the optical system 16, 14, 15, 13, 7, so arranged that the optical path is of considerable length. To permit the use of hemispheres of different refractive index the prism 13 is adjustable about a pivot in the casing 3. The refractive index of a gem placed on the surface of the hemisphere is read off directly on the graduated disc 24 in the focal plane of the eye piece 23. The increased length of optical path improves the definition and enlarges the scale readings.
GB2734525A 1925-10-30 1925-10-30 Improvements in and relating to refractometers Expired GB257127A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2734525A GB257127A (en) 1925-10-30 1925-10-30 Improvements in and relating to refractometers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2734525A GB257127A (en) 1925-10-30 1925-10-30 Improvements in and relating to refractometers

Publications (1)

Publication Number Publication Date
GB257127A true GB257127A (en) 1926-08-26

Family

ID=10258063

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2734525A Expired GB257127A (en) 1925-10-30 1925-10-30 Improvements in and relating to refractometers

Country Status (1)

Country Link
GB (1) GB257127A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2740320A (en) * 1954-10-22 1956-04-03 Bausch & Lomb Refractometer
US3778165A (en) * 1971-05-24 1973-12-11 Hamilton Co Portable flow-through dispensing refractometer apparatus
US4640616A (en) * 1984-12-06 1987-02-03 The Cambridge Instrument Company Plc Automatic refractometer
US7492447B2 (en) 2002-10-30 2009-02-17 Atago Co., Ltd. Refractometer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2740320A (en) * 1954-10-22 1956-04-03 Bausch & Lomb Refractometer
US3778165A (en) * 1971-05-24 1973-12-11 Hamilton Co Portable flow-through dispensing refractometer apparatus
US4640616A (en) * 1984-12-06 1987-02-03 The Cambridge Instrument Company Plc Automatic refractometer
US7492447B2 (en) 2002-10-30 2009-02-17 Atago Co., Ltd. Refractometer

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