It was not successfully built until five years after Newton's first reflecting telescope. Newton's idea for a reflecting telescope was not new. The small field of view of the reflecting telescope rendered the instrument impractical for searching. In late 1668, he was able to produce this first reflecting telescope. However, conceptually it is easier to derive by considering a reflecting telescope. In 1671 the Royal Society asked for a demonstration of his reflecting telescope. This parabolic reflector can serve as the primary mirror of a reflecting telescope. In 1671, the Royal Society asked for a demonstration of his reflecting telescope. Huggins also established an 18 inch diameter reflecting telescope in 1870. Newton also developed the reflecting telescope. Douglass made plans to use the Steward gift to construct a 36-inch Newtonian reflecting telescope. In late 1668 Isaac Newton built his first reflecting telescope. The Subaru Telescope is a Ritchey-Chretien reflecting telescope. A two-foot aperture reflecting telescope was manufactured at the observatory itself. Isaac Newton was the first to successfully build a reflecting telescope in 1668.