http://iet.metastore.ingenta.com
1887

History of the electrical units and early standards

History of the electrical units and early standards

For access to this article, please select a purchase option:

Buy article PDF
$19.95
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Your details
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:
 
 
 
 
 
IEE Proceedings A (Physical Science, Measurement and Instrumentation, Management and Education, Reviews) — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

In 1861 the British Association set up a committee, led by Thomson (i.e. Kelvin) and Clerk Maxwell, which proposed the electrical units which are still in use, based on the metric system. Names were given to them to avoid ambiguities, and prefixes based on ratios of 1000 were introduced, both on the lines suggested by Bright and Latimer Clark. These units, specified by material standards, became the International Units of 1893, which were in use until the SI units superseded them in 1948. The BA owned standard resistors made in 1865 and standard capacitors made in 1889. The resistors, which still exist, were less stable than the BA had hoped, and the true value of the BA ohm was uncertain.

References

    1. 1)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 279.
    2. 2)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 281.
    3. 3)
      • R.L. Stevenson , S. Colvin , J.A. Ewing . (1887) , Papers Literary, Scientific, etc. by the late Fleeming Jenkin.
    4. 4)
      • Clark, L., Bright, C.: `On the formation of standards of electrical quantity and resistance', BA Annual Report, 1862, p. 37–38, (reporting the 1861 meeting) Trans. of Sections.
    5. 5)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 1.
    6. 6)
      • Anon . (1861) The Electrician.
    7. 7)
      • A press cutting in ‘Telegraphic Notes’ collected by Sir Charles Bright, 4, p. 172, held in the IEE Archives.
    8. 8)
      • P. Strange . Two electrical periodicals: The Electrician and Electrical Review 1880–1890. IEE Proc. A. , 8 , 574 - 581
    9. 9)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 219.
    10. 10)
      • L. Clark . (1862) The Electrician.
    11. 11)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 60.
    12. 12)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 9.
    13. 13)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 295.
    14. 14)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 202.
    15. 15)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 296.
    16. 16)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 2.
    17. 17)
      • F.E. Smith , R.T. Glazebrook . (1922) , Dictionary of physics.
    18. 18)
      • J.S. Thompson , H.G. Thompson . (1920) , Silvanus Philips Thompson, his life and letters.
    19. 19)
      • J.N. Shoolbred . On the measurement of electricity for commercial purposes. J. Soc. Telegraph Engineers , 84 - 107
    20. 20)
      • W. Ayrton , J.S. Perry . Modes of measuring the cients of self and mutual induction. J. Soc. Telegraph Engineers , 292 - 341
    21. 21)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 135.
    22. 22)
      • O. Heaviside . (1892) , Electrical Papers.
    23. 23)
      • S.P. Thompson . (1900) , Elementary lessons in electricity and magnetism.
    24. 24)
      • Harrison, H.E.: Minutes, 1891, Board of Trade Electrical Standards Committee, p. 59.
    25. 25)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 485–489.
    26. 26)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 520–521, and p. 650.
    27. 27)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 603–604.
    28. 28)
      • W. Duddell . Report to Council on the International Electrical Congress at St. Louis. J. IEE , 171 - 176
    29. 29)
      • G.L.T. Giorgi . Electromagnetic units. Elettricita , 787 - 788
    30. 30)
      • O. Heaviside . (1899) Electromagnetic theory, The Electrician.
    31. 31)
      • J.S. Perry . Practical electromagnetic units. The Electrician
    32. 32)
      • Baily F.G., in Reference 1, p. 535.
    33. 33)
      • Obituaries. J. IEE
    34. 34)
      • Obituaries. J. IEE
    35. 35)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 45.
    36. 36)
      • : `Report of Committee for selection and nomenclature of dynamical and electrical units', BA Annual Report, 1874, p. 222–225, reporting the 1873 meeting.
    37. 37)
      • Kennelly A.E. in Reference 1, p. 650.
    38. 38)
      • W.H. Preece . On the measurement of currents. J. Soc. Telegraph Engineers , 448 - 452
    39. 39)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 20.
    40. 40)
      • J.J. Thomson . (1936) , Recollections and reflections.
    41. 41)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. xx.
    42. 42)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 198.
    43. 43)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 320.
    44. 44)
      • Board of Trade Electrical Standards Committee, 1891, Minutes, p. 2.
    45. 45)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 47.
    46. 46)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 158.
    47. 47)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 167, and 197.
    48. 48)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 193.
    49. 49)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 340, and 604.
    50. 50)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 501.
    51. 51)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 190, and 196.
    52. 52)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 211.
    53. 53)
      • Chrystal, G., Saunder, S.A.: `Results of a comparison of the British Association units of electrical resistance', BA Annual Report, 1876, p. 13–19.
    54. 54)
      • GLAZEBROOK R.T., and FITZPATRICK T.C., in Reference 1, pp. 343–355.
    55. 55)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 716–728.
    56. 56)
      • R.T. Glazebrook , L. Hartshorn . B.A. standards of resistance, 1865–1932. Phil. Mag. , 666 - 681
    57. 57)
      • B.W. Petley . Stability of BA standards of resistance. NPL News , 10 - 12
    58. 58)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 175.
    59. 59)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 200.
    60. 60)
      • Muirhead, A.: `Notes on the constancy of capacity of certain accumulators', BA Annual Report, 1879, p. 283–285.
    61. 61)
      • : Reports of the [BA] Committee on electrical standards, 1913, p. 376.
    62. 62)
      • G.L. Molesworth , H.B. Molesworth . (1899) , A pocketbook of useful formulae and memoranda for civil and mechanical engineers.
    63. 63)
      • Anon . New Ideas. Post Office Electrical Engineers, Journal
http://iet.metastore.ingenta.com/content/journals/10.1049/ip-a-1.1985.0097
Loading

Related content

content/journals/10.1049/ip-a-1.1985.0097
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
This is a required field
Please enter a valid email address