Mystery object on May 28, 2019 Get link Facebook Twitter Pinterest Email Other Apps Thanks to Simon Hathaway for sending me this picture of a mystery object, which geographers might be able to recognise. It apparently dates from around 1789. Comments Jacqueline said… Can we say what it is? Alan Parkinson said… If you like, please do - it's the only way I will know that you know what it is :) Alan Parkinson said… By the way, the object is a cyanometer for measuring the blueness of the sky...
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