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Cover image courtesy of Mr Richard Keeler, Curator, museum of the Royal College of Ophthalmologists, UK. Cover photo: Mark Thomas
Sir John Herschel, born in Slough, England in 1792, was a distinguished mathematician and astronomer. His father, German-born Friedrich Wilhelm Herschel (Sir Frederick William Herschel) discovered the planet Uranus. One of Sir John's many contributions to science was the concept that two prisms of equal power when rotated in opposite directions give gradually increasing power from zero to double the power of each individual prism. Based on this principle he developed an optical instrument with rotating …
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