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This is a list of large optical telescopes.For telescopes larger than 3 meters in aperture see List of largest optical reflecting telescopes.This list combines large or expensive reflecting telescopes from any era, as what constitutes famous reflector has changed over time.
United had a 1 + 1 ⁄ 2-inch hole. [20]: 210 2 in (51 mm) Seeburg 1000 records have a 2-inch center hole. [21] 3 in (76 mm) Aretino had a three-inch hole. [20]: 9 The 3-inch spindle format would be resurrected some 40 years later for the Holy Bible Old and New Testaments produced at 16 RPM by the Audio Book Company of St. Joseph, Michigan. The ...
The 3-inch round was chosen because it was the smallest caliber ammunition that could be fitted with a VT radar proximity fuze. The twin barrel mount was believed to be more effective against faster aircraft and guided missiles than the single mounted 5"/54 caliber Mark 42 gun , hence, the single barrel version of the Mark 26 never saw service use.
The era of the large glass-mirror reflector had begun, with telescopes such as Andrew Ainslie Common's 1879 36-inch (91 cm) and 1887 60-inch (152 cm) reflectors built at Ealing, and the first of the "modern" large glass-mirror research reflectors, 60-inch (150 cm) Mount Wilson Observatory Hale Telescope of 1908, the 100-inch (2.5 m) Mount ...
The 3-inch anti-aircraft gun M3 was an American anti-aircraft gun which served throughout the 1930s and into early World War II. [2] Developed from the earlier 3-inch M1917 and 3-inch M1918 guns, it was in the process of being replaced by the time of the US entry into World War II, but was subsequently adapted into an anti-tank gun role, both free-standing (as the 3-inch M5) and in a self ...
Silvered glass mirrors were a vast improvement over speculum metal and made reflectors a practical instrument. The era of large reflectors had begun, with telescopes such as the 36-inch (91 cm) Crossley Reflector (1895), 60-inch (1.5 m) Mount Wilson Observatory Hale telescope of 1908, and the 100-inch (2.5 m) Mount Wilson Hooker telescope in 1917.
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