Amazing piece of metal (speculum)
Published on June 20, 2017
This small disc of metal – made from speculum – is an important part of history.
The metal is an alloy of tin and copper with some arsenic thrown in.
Discussed by Professor Martyn Poliakoff at the Royal Society, in London.
It is the primary mirror from Sir Isaac Newton’s original reflecting telescope.
Brady inside big telescopes:
More chemistry at
us on at
And on at
From the School of Chemistry at The University of Nottingham:
Periodic Videos films are by video journalist Brady Haran:
A run-down of Brady’s channels:
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