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
Sky & Telescope separate magazines, "The Sky" and "The Telescope". In 2005, Sky Publishing Corporation was acquired by New Track Media, a portfolio company of the private equity firm Boston Ventures. In 2014, New Track was sold to F+W Media. The magazine played an important role in the dissemination of knowledge about telescope making, through the column "Gleanings for ATMs" that ran from 1933 to 1990. Its main competitor is "Astronomy". Sky & Telescope Sky & Telescope (S&T) is a monthly American magazine covering all aspects of amateur astronomy, including the following: The articles are intended for the informed lay reader and include