The 72-inch (1.8 m) telescope replaced a 36-inch (910 mm) telescope that he had built previously. He had to invent many of the techniques he used for constructing the Leviathan, both because its size was without precedent and because earlier telescope builders had guarded their secrets or had simply failed to publish their methods. Rosse's telescope was considered a marvelous astronomical and engineering achievement.
Lord Rosse performed astronomical studies and discovered the spiral nature of some nebulas. He named the Crab Nebula. A main component of Rosse's nebular research was attempting to resolve the nebular hypothesis, which posited that planets and stars were formed by gravity acting on gaseous nebulae.
(https://en.wikipedia.org/wiki/William_Parsons,_3rd_Earl_of_Rosse)
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