For two seasons in 1865 and 1866 I had the honour of being Lord Rosse's astronomer.
It was designed and constructed in 1845 by the late Earl of Rosse, and has rendered great service to science.
That of the great Rosse speculum was no less than four tons.
The Rosse speculum—six feet in diameter and three tons in weight—reposes at the lower end of a telescope fifty-five feet long.
The colossal Rosse reflector still marks, as to size, the ne plus ultra of performance in that line.
