James Nasmyth

James Hall Nasmyth (sometimes spelled Naesmyth, Nasmith, or Nesmyth) (19 August 1808 – 7 May 1890) was a Scottish engineer, philosopher, artist and inventor famous for his development of the steam hammer.

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Painting of Sunspot by James Nasmyth, 1860. Nasmyth discovered fine scale solar features, which he called 'willow-leaf-shaped objects'. Now known as solar granulation, their existence was disputed for many years