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The frame of a sextant is in the shape of a sector which is approximately 1 ⁄ 6 of a circle (60°), [2] hence its name (sextāns, sextantis is the Latin word for "one sixth"). "). Both smaller and larger instruments are (or were) in use: the octant, quintant (or pentant) and the (doubly reflecting) quadrant [3] span sectors of approximately 1 ⁄ 8 of a circle (45°), 1 ⁄ 5 of a circle (72 ...
The Y level or wye level is the oldest and bulkiest of the older style optical instruments. A low-powered telescope is placed in a pair of clamp mounts, and the instrument then leveled using a spirit level, which is mounted parallel to the main telescope. The term dumpy level (also builder's level) endures despite the evolution in design. They ...
An Estoppey D-1 in the bomb aiming window of a Martin MB-2 bomber. In this case, the sight is rotated to the right to account for wind. The Estoppey D-series was a line of inter-war era bombsights developed by Georges Estoppey of the US Army Air Corps' McCook Field, starting with the D-1 of 1922.
Postwar analysis placed the overall accuracy of daylight precision attacks with the Norden at about the same level as radar bombing efforts. The 8th Air Force put 31.8% of its bombs within 300 meters (1,000 ft) from an average altitude of 6,400 meters (21,000 ft), the 15th Air Force averaged 30.78% from 6,200 meters (20,500 ft), and the 20th ...
The electronic autocollimator is a high precision angle measurement instrument capable of measuring angular deviations with accuracy down to fractions of an arcsecond, by electronic means only, with no optical eye-piece. EAC-1012
At 2 inches (5.1 cm) in diameter and 0.5 inches (13 mm) thick, both surfaces are flat to within 1/10 of the wavelength of the light (58.9 nm), as indicated by the perfectly straight fringes. An optical flat is an optical -grade piece of glass lapped and polished to be extremely flat on one or both sides, usually within a few tens of nanometres ...
Jan 29, 2025, 5:30 p.m. ET. Contents: ... I mean, this is the level of precision no one has been able to achieve. ... so far has been approximately $5 billion. And for 2025, we expect our capex to ...
TrackingPoint is an applied technology company based in Austin, Texas.In 2011, it created a long-range rifle system that was the first precision guided firearm. [1] [2]Formed by John McHale in February 2011, the company created its first PGF prototype in March 2011.
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