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A Suffolk latch is a type of latch incorporating a simple thumb-actuated lever and commonly used to hold wooden gates and doors closed. Comparison of Suffolk and Norfolk latches. The Suffolk latch originated in the English county of Suffolk in the 16th century and stayed in common use until the 19th century. They have recently come back into ...
A plan and side view of a generic, empty canal lock. A lock chamber separated from the rest of the canal by an upper pair and a lower pair of mitre gates.The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.
A gated SR latch circuit diagram constructed from AND gates (on left) and NOR gates (on right) A gated SR latch can be made by adding a second level of NAND gates to an inverted SR latch. The extra NAND gates further invert the inputs so a SR latch becomes a gated SR latch (a SR latch would transform into a gated SR latch with inverted enable).
There is a number of different single-output circuits of C-element built on logic gates. [42] [43] In particular, the so-called Maevsky's implementation [44] [45] [46] is a semimodular, but non-distributive (OR-causal) circuit loosely based on. [47] The NAND3 gate in this circuit can be replaced by two NAND2 gates.
A gate may have a latch that can be raised and lowered to both open a gate or prevent it from swinging. [3] Gate operation can be either automated or manual. Locks are also used on gates to increase security. Larger gates can be used for a whole building, such as a castle or fortified town.
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