Telescope speculum grinding tool for Lord Rosse's 72-inch telescope at Birr Castle, Ireland Images A-I foregrounding the approach by bridge

foregrounding the approach by bridge

and is full of flowers

25th July 1995

It is an appeal for precautions against forgery by the Bank of England

Telescope speculum grinding tool for Lord Rosse's 72-inch telescope at Birr Castle, Ireland Images A-I foregrounding the approach by bridgePlate 24 figure 3 from the paper 'On the construction of specula of six feet aperture; and a selection from the observations of nebulae made with them', by William Parsons, 3rd Earl of Rosse, Philosophical Transactions of the Royal Society, volume 151 (1861) pp. 681 746. A rear view of the cast iron grinding tool used to produce the speculum (mirror) of the reflecting telescope at Birr Castle, Parsonstown, Ireland. The circular tool is shown suspended