100
A Philosopher Giving a Lecture on the Orrery
https://www.khanacademy.org/humanities/monarchy-enlightenment/britain-18c/britain-ageof-revolution/a/wright-of-derby-a-philosopher-lecturing-on-the-orrery
http://www.britishmuseum.org/research/collection_online/collection_object_details.aspx?objectId=1454333&partId=1
