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Fig. 5.9 Four different visual conceptualizations of solar granulation: top left, interlacing leaf
pattern - Nasmyth 1860; top right, willow-leaf pattern - Nasmyth and Herschel 1861; bottom left,
rice grains - Stone and Nasmyth 1864; bottom right, pores - Huggins 1865/66
5 Angelo Secchi, Stellar Spectroscopy, Solar Physics, and Visual Science Culture