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Grand Central Dispatch (GCD or libdispatch) is a technology developed by Apple Inc. to optimize application support for systems with multi-core processors and other symmetric multiprocessing systems. [2] It is an implementation of task parallelism based on the thread pool pattern. The fundamental idea is to move the management of the thread ...
Grand Central Terminal served intercity trains until 1991, when Amtrak consolidated its New York operations at nearby Penn Station. [N 2] Grand Central covers 48 acres (19 ha) and has 44 platforms, more than any other railroad station in the world. Its platforms, all below ground, serve 30 tracks on the upper level and 26 on the lower.
Clock in Grand Central Terminal on the information kiosk. The clock has four 24-inch (61 cm) dials and was made by the Self Winding Clock Company. It was installed in 1913. The Self Winding Clock Company (SWCC) was a major manufacturer of electromechanical clocks from 1886 until about 1970. [1]
Clock detail. There is a 13-foot-wide (4.0 m) clock on top of the south facade. It was installed in 1914 by the Self Winding Clock Company.The clock face has decorative stained glass framed in bronze, with cast-iron clock hands, the latter weighing 340 lbs. [9] [10] The center of the clock features a circular panel with a sunburst design. [11]
The master clock in a clock network can receive accurate time in a number of ways: through the United States GPS satellite constellation, a Network Time Protocol server, the CDMA cellular phone network, a modem connection to a time source, or by listening to radio transmissions from WWV or WWVH, or a special signal from an upstream broadcast network.
Ridgeway Clocks is a division of Howard Miller Company, and is a producer of longcase clocks, mantle clocks, and wall clocks. The company's facilities are located in Zeeland Michigan. According to Furniture Today magazine, Howard Miller is one of only three major manufacturers of floor clocks in the U.S. [citation needed]
The smallest of Chicago's passenger rail terminals, Grand Central Station was a relatively quiet place, even during its heyday. Grand Central never became a prominent destination for large numbers of cross-country travelers, nor for the daily waves of commuters from the suburbs, that other Chicago terminals were.
Grand Central Terminal is a major commuter rail terminal in Midtown Manhattan, New York City, serving the Metro-North Railroad's Harlem, Hudson and New Haven Lines. It is the most recent of three functionally similar buildings on the same site. [ 1 ]