Amazing piece of metal (speculum)

2014-02-05

[public] 822K views, 11.6K likes, 135 dislikes audio only

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: http://bit.ly/telescopetours

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