Which astronomer followed up on NGC 6369 using the 'Leviathan of Parsonstown'?

Answer

William Parsons, the 3rd Earl of Rosse

In 1851, William Parsons, the 3rd Earl of Rosse, turned his massive six-foot reflector upon the nebula and noticed its annular shape.

Which astronomer followed up on NGC 6369 using the 'Leviathan of Parsonstown'?
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