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Isaac Newton's Design for a Reflecting Telescope
18" x 24"
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Giclee Print

Diagram of Sir Isaac Newtons design for a reflecting telescope Known also as the Newtonian telescope It worked by concentrating light by reflection from a parabolic mirror instead of by refraction through a lens Newton first displayed this telescope to King Charles II based on a design of It had a focal length of cm and could magnify times Inadequate mirrors meant that the Newtonian reflector was not as refined as contemporary refracting telescopes until when James Hadley ground a quality parabolic mirror This drawing was published in the Philosophical Transactions of the Royal Society in