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Bar gates, especially manually operated ones, are often counterweighted to allow easier manual control. [7] Bar gates are frequently paired end to end or closely offset to block traffic in both directions. Some bar gates also have a second arm which hangs 30 to 40 cm below the upper arm when lowered to increase approach visibility.
Q = 1 (1, 0) – referred to as an S (dominated)-latch; Q = 0 (0, 1) – referred to as an R (dominated)-latch; This is done in nearly every programmable logic controller. Hold state (0, 0) – referred to as an E-latch; Alternatively, the restricted combination can be made to toggle the output. The result is the JK latch.
The room above the gate itself was probably added shortly after 1400 and the town steward books mention a banquet held there in 1434. [12] It was originally used as the city's guildhall, until the 1770s. [13] It was at this point that the city began to grow to the north of the gate. [14]
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The Bar's most notable feature is its barbican, which is the only one surviving on a town gate in England. It also retains its portcullis and has reproduction 15th century oak doors. On the inner side, an Elizabethan house, supported by stone Tuscan order columns (originally of Roman origin but modified in 1584), extends out over the gateway.
A "great ditch", later called Bar Dike, had been built on west side of the town by 1169, and by the 13th century there were a couple of formal gateways to the town: North Bar and South Bar (later called Keldgate Bar). [1] In 1322, however the town of Beverley petitioned parliament, requesting that they be allowed to build a protective town wall ...
Many surviving gates have been heavily restored, rebuilt or new ones created to add to the appearance of a city, such as Bab Bou Jalous in Fes. With increased levels of traffic, city gates have come under threat in the past for impeding the flow of traffic, such as Temple Bar Gate in London which was removed in the 19th century.
The gate can be represented with the plus sign (+) because it can be used for logical addition. [1] Equivalently, an OR gate finds the maximum between two binary digits, just as the AND gate finds the minimum. [2] Together with the AND gate and the NOT gate, the OR gate is one of three basic logic gates from which any Boolean circuit may