Below are a couple good examples of illustrations from Newton's Optics (1704):
https://library.bowdoin.edu/arch/exhibits/50books/images/gallery/newton.jpg
http://cdn.archinect.net/images/1200x/0n/0ni5vf7cagb021lg.jpg
This paper by Newton was one of his earliest reports on his experiments with light; it describes his experimental process: http://www.newtonproject.sussex.ac.uk/view/texts/normalized/NATP00006
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