May I recommend the BBC podcast named

Seeing is believing , the Leviathon of Parsontown.

It is available for about 30 days I heard it yesterday of radio 4

I made the pilgrimage to that telescope in Ireland the 6 foot reflector was the biggest in the world at the time. Not mentioned in the podcast is the moon work where he estimated the moon surface temperature by spectroscopy and though ridiculed at the time, turned out to be right. The podcast reveals the intellectual and religious debate at the time about evolution. nebulae, as seen by Herschal, were the focus.