Lord Rosse's Great Telescope The Sky at Night : Season 18 Episode 10
BBC Four 20m
Aired: October 2nd, 1974 @ 10:00 PM EST on BBC Four
A century ago, the most powerful telescope in the world was the great 72-inch reflector at Birr Castle in Eire, with which its builder, the 3rd Earl of Rosse, discovered the spiral galaxies.
