This was the first working reflecting telescope ... underwent improvements in the coming centuries. Designers of refracting telescopes figured out, for one, that by using two different kinds ...

Refracting telescopes dominated the nineteenth ... This opened the way for the great reflecting telescopes of the twentieth century — epitomized by the 200-inch Hale on Mount Palomar and by ...

Traditional refracting lenses use their curvature ... flown aboard balloons or aircraft need to be compact. Although ...

FitzRandolph Observatory was constructed in 1934 to replace the Halsted Observatory. In 1966, a 36" reflecting telescope replaced the old 23" refracting telescope that had been in use since 1882.

Chinese scientists are working to set up the world's largest refracting telescope in Tibet Autonomous Region for observing stars and planets. Deputy Director of the regional department of science and ...