How to work with the › Forums › Spectroscopy › Amateur Spectroscopy over 100 years ago › How to work with the 9 November 2018 at 7:58 am #580202 Mr Jack MartinParticipant 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
