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The result has been a proliferation of larger telescopes which would have been expensive to build or buy, and unwieldy to operate, using "traditional" construction methods. Whereas an 8 inch Newtonian telescope would have been considered large in the 1970s, today 16 inch systems are common, and huge 32 inch systems not all that rare. [36]
The 100-inch Hooker telescope at Mt Wilson fundamentally changed the scientific view of the Universe Hooker Telescope enclosure. The 100-inch (2.5 m) Hooker telescope located at Mount Wilson Observatory, California, was completed in 1917, and was the world's largest telescope until 1949.
The term "downdraft" can also refer to a type of backdraft which occurs through chimneys which have fireplaces on the lowermost levels (such as basements) of multi-level buildings. It involves cold air coming down the chimney due to low air pressure, and makes it hard to light fires, and can push soot and carbon monoxide into domiciles.
The MAS Modèle 36 (also known as the Fusil à répétition 7 mm 5 M. 36 [1]) is a military bolt-action rifle. First adopted in 1936 by France and intended to replace the Berthier and Lebel series of service rifles, it saw service long past the World War II period. It was manufactured from late 1937 onward by Manufacture d'Armes de Saint ...
Telescoping in mechanics describes the movement of one part sliding out from another, lengthening an object (such as a telescope or the lift arm of an aerial work platform) from its rest state. [1] In modern equipment this can be achieved by a hydraulics , but pulleys are generally used for simpler designs such as extendable ladders and amateur ...
The rear flank downdraft can arise owing to negative buoyancy, which can be generated by cold anomalies produced at the rear of the supercell thunderstorm by evaporative cooling of precipitation or hail melting, or injection of dry and cooler air in the cloud, and by vertical perturbation pressure gradients that can arise from vertical gradients of vertical vorticity, stagnation of ...
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