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Observations of Sun-Spot Spectra1


    I. The Widening of Iron Lines and of Unknown Lines in Relation to the Sun-spot Period. IT is now twenty-eight years since I discovered that the lines seen in sun-spots were subject to widening,2 and that different lines were widened at different times.


    1. 1

      A Paper read at the Royal Society, by J. Norman Lockyerv C.B., F.R.S.

    2. 2

      "Roy. Soc. Proc." vol. xv. p. 256, 1866.

    3. 3

      "Roy. Soc. Proc." vol. xl. p. 347.

    4. 4

      "Roy. Soc. Proc." vol. liv. p. 359.

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