Hale Telescope mirror.. It was completed in 1948 and is still in active use. The Hale Telescope represented the technological limit in building large optical telescopes for over 30 years. It was the largest telescope in the world until the Russian BTA-6 was built in 1976, and the second largest until the construction of the Keck Observatory Keck 1 in 1993. Hale supervised the building of the telescopes at the Mount Wilson Observatory with grants from the Carnegie Institution of Washington: the telescope in 1908 and the telescope in 1917. These telescopes were very successful, leading to the rapid advance in understanding
IRAM 30m telescope from the Solar System to interstellar dust and gas or cosmology. Formally started in 1980 and in use for astronomical observations beginning in 1984, the observatory features a radio telescope produced by MT Mechantronics with a pedestal-yoke design. The 30m telescope is one of the largest and most sensitive millimeter telescopes in the world, and is equipped with a suite of heterodyne receivers and continuum cameras operating at wavelengths of around 3, 2, 1, and 0.9mm. IRAM offers guided tours through the observatory and public talks during the summer months. IRAM 30m telescope The IRAM 30m millimeter radio telescope is