History of the telescope a wider field of view than a classic Cassegrain. During the period 1850–1900, reflectors suffered from problems with speculum metal mirrors, and a considerable number of "Great Refractors" were built from 60 cm to 1 metre aperture, culminating in the Yerkes Observatory refractor in 1897; however, starting from the early 1900s a series of ever-larger reflectors with glass mirrors were built, including the Mount Wilson 60-inch (1.5 metre), the 100-inch (2.5 metre) Hooker Telescope (1917) and the 200-inch (5 metre) Hale telescope (1948); essentially all major research telescopes since 1900 have been reflectors. A number of 4-metre class (160 inch)
Until the End of the World (soundtrack) The Aka Pygmy and Indigenous Australian music used in the film are from field recordings from two collections: "Centrafrique: Anthologie de la musique des Pygmées Aka", 1978, and "Les Aborigènes: Chants et danses de l'Australie du nord", 1979, respectively. Album Until the End of the World (soundtrack) Until the End of the World: Music from the Motion Picture Soundtrack is a soundtrack album to the film of the same name, released in 1991 on Warner Bros. Records. One song on the album, U2's "Until the End of the World", had been previously released on that band's 1991 album "Achtung Baby",