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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.
Many combination locks have three wheels, but the lock may be equipped with additional wheels, each with a drive pin and fly, in a similar manner. The number of wheels in the mechanism determines the number of specific dial positions that must be entered to open the lock, so a three-sequence combination is required for a three-wheel lock.
The lock chamber is 600 feet (180 m) long, 80 feet (24 m) wide, and 22 feet (6.7 m) deep and can accommodate up to 100 vessels at once. It contains two pair of 30 feet (9.1 m) tall sector gates. [4] The lock requires 12–15 minutes to cycle through a typical water-level difference of two to five feet (0.61 to 1.52 m). [2]
[2] In the United States, typically, the face bore is sized from 1.5 to 2.125 inches (3.81 to 5.40 cm) in diameter and is centered at 2.375 or 2.75 inches (6.03 or 6.99 cm) from the leading edge of the door. This distance is referred to as the "backset." [3] Other, less popular, backsets are at 3.75 and 5 inches (9.5 and 12.7 cm). Residential ...
This example has two bolts: a sprung latch at the top, and a locking bolt at the bottom. Right: the box keep, installed in the doorjamb. A mortise lock (also spelled mortice lock in British English) is a lock that requires a pocket—the mortise—to be cut into the edge of the door or piece of furniture into which the
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.
A failure of the lock gates—for example, caused by a runaway ship hitting a gate—could unleash a flood on the lands downstream of the locks, as the lake above the locks (Gatun Lake or Miraflores Lake) drains through the lock system. Extra precaution against this is provided by doubling the gates at both ends of the upper chamber in each ...
The Goose Creek lock is a staircase lock or combine lock: [10] two locks with no intervening pound or basin, the upper gate of the lower lock being the same gate as the lower gate of the second lock. It was perhaps the only such lock on the C&O Canal.
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