Largest mirror made from metal According to Official Guinness Records,
The largest metal mirror is a 183-cm (72-in) reflector, made by the third Earl of Rosse (1800-67), and set up at Birr Castle, Co. Offaly, Republic of Ireland in 1845. The mirror was made of speculum metal (an alloy of copper and tin). With it, Lord Rosse discovered the spiral forms of the galaxies. It was last used in 1909, but was restored with a mirror made of aluminium in 1998.
For a complete list of 1845 records, please visit 1845 Guinness Records in Ireland .
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