Scraper board Sol.

Thinking of ways to draw the very fine details observed by eye, I came across some bits of scraper board. This is a thin layer of chalk bound to card and overlaid by a layer of black ink. Any scratches made in the surface show as white. White board is also available.

A few scratches show the very fine detail to be gleaned by eye using the Lunt 35THa. This has a tilting etalon giving surface and chromosphere details at the same time. The Ha “window” is quite wide with a good sweet spot. Nick.Todays brief Sol, above.

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