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9 November 2018 at 7:58 am
#580202
![](https://britastro.org/wp-content/uploads/2017/01/picture-5979-1485519744-80x80.jpg)
Participant
How to work with the spectroscope by John Browning 1878 Cambridge library collection lists McLean’s star spectroscope for £2 10 0 !
Jack
Essex UK