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)
Telescope Hill the tower and enjoy the view. The first fire observer was Al Lucas, who served for two years, followed by Frank Forsyth, who served until 1948. Starting in 1922, the Suffolk County fire observers were supervised by State District Fire Ranger Clarence Dare of Selden. During World War II, a new cab was built below the original cab to be used for fire watching, and the original was used by Civil Defense observers. Nazi "U-Boats" were spotted three times from Telescope Hill, one of which was captured after being spotted. As suburban growth spread through the area and fire tower