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)
Major Atmospheric Cerenkov Experiment Telescope and secure operation of the telescope remotely from anywhere in the world, and its structure is designed to operate in winds of speed up to 30 km/h and retain its structural integrity in the parking position in winds of speed up to 150 km/h. Major Atmospheric Cerenkov Experiment Telescope Major Atmospheric Cerenkov Experiment Telescope (MACE) is the world's largest telescope at the highest altitude being established at Hanle, Ladakh, India. It is being built by Electronics Corporation of India, Hyderabad, for the Bhabha Atomic Research Centre. It was assembled at the campus of Indian Astronomical Observatory at Hanle. Operational since