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Cameras with focal-plane shutters—even if they had PC connectors with X, F, M, or S-sync delays ("xenon sync" with zero delay and flashbulbs with peak delays of 5, 20, and 30 ms)—could not be used at speeds that attenuated guide numbers with most types of flashbulbs because their light curves were characterized by rapid rise and fall rates; the second shutter curtain would begin wiping ...
The Internet (or internet) [a] is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) [b] to communicate between networks and devices.
The Enigma machine was invented by German engineer Arthur Scherbius at the end of World War I. [4] The German firm Scherbius & Ritter, co-founded by Scherbius, patented ideas for a cipher machine in 1918 and began marketing the finished product under the brand name Enigma in 1923, initially targeted at commercial markets. [5]
The St. Louis metropolitan area is served by MetroLink (known as Metro) and is the 11th-largest light rail system in the country with 46 mi (74 km) of double track light rail. The Red Line and The Blue Line both serve all the stations in the inner city, and branch to different destinations beyond in the suburban areas.
A portion of Babbage's Difference Engine Trial model of a part of the Analytical Engine, built by Babbage, as displayed at the Science Museum, London The Industrial Revolution (late 18th to early 19th century) had a significant impact on the evolution of computing hardware, as the era's rapid advancements in machinery and manufacturing laid the ...
Arc welding produces intense visible and ultraviolet light. Typical gas metal arc welding has an irradiance of 5W/m 2 for the welder, which is many times brighter than sunlight. [85] This can cause a condition called arc eye or flash burns, in which ultraviolet light causes inflammation of the cornea, and can burn the retinas of the eyes.