William Duddell

Duddell's devices

Top-left: Duddell moving-coil oscillograph with mirror in oil bath. Top-middle: Rotating shutter and moving mirror assembly used with Duddell oscillograph, for placing time-index marks next to the waveform pattern. Top-right: Moving-film camera for recording the waveform. Bottom: Film recording of sparking across switch contacts, as a high-voltage circuit is disconnected.[1][2][3][4]

William Du Bois Duddell (1 July 1872, in Kensington, London[5] – 4 November 1917, in Wandsworth, London)[6][7] was an English physicist and electrical engineer. His inventions include the moving coil oscillograph,[8] as well as the thermo-ammeter and thermo-galvanometer.

  1. ^ Hawkins Electrical Guide, Theo. Audel and Co., 2nd ed. 1917, vol. 6, Chapter 63: Wave Form Measurement, p. 1858, Fig. 2607
  2. ^ Hawkins Electrical Guide, Theo. Audel and Co., 2nd ed. 1917, vol. 6, Chapter 63: Wave Form Measurement, p. 1855, Fig. 2620
  3. ^ Hawkins Electrical Guide, Theo. Audel and Co., 2nd ed. 1917, vol. 6, Chapter 63: Wave Form Measurement, p. 1866, Figs. 2621–2623
  4. ^ Hawkins Electrical Guide, Theo. Audel and Co., 2nd ed. 1917, vol. 6, Chapter 63: Wave Form Measurement, p. 1867, Fig. 2625
  5. ^ "Search Results for England & Wales Births 1837-2006 | findmypast.co.uk".
  6. ^ "Search Results for England & Wales Deaths 1837-2007 | findmypast.co.uk".
  7. ^ British Academy; Henry Colin Gray Matthew; Brian Howard Harrison; British Academy (2004). Oxford Dictionary of National Biography: In Association with the British ... Original from the University of Michigan: Oxford University Press. p. 54. ISBN 0-19-861411-X.
  8. ^ Cite error: The named reference Hong was invoked but never defined (see the help page).