Call for Assistance 20 October 2018 Can you help identify these items from the Museum archive? They are listed as a pair of measuring tubes, a Wilson’s cloud chamber and a spectroscope. What were they used for? One Comment Don Cleavin December 23rd, 2018 First item is a Ringrose CO2 indicator. I forgot how to work it years ago. No idea about the other two. Log in to Reply Leave a Reply Cancel replyYou must be logged in to post a comment.