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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.
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The caisson lock is a type of canal lock in which a narrowboat is floated into a sealed watertight box and raised or lowered between two different canal water levels. It was invented in the late 18th century as a solution to the problem posed by the excessive demand for water when conventional locks were used to raise and lower canal boats ...
Mooring ring (permanent) affixed between the edge of the canal and the tow path, with (boat operator supplied) rope to the boat. [17] Mooring bollard (permanent) affixed canal-side on lock-approaches for the short-term mooring of advancing boats and lock-side to assist in ascent and descent. [17]
An electronic apex locator is an electronic device used in endodontics to determine the position of the apical constriction and thus determine the length of the root canal space. The apex of the root has a specific resistance to electrical current, and this is measured using a pair of electrodes typically hooked into the lip and attached to an ...
You look more like a navvy." In "Destiny of the Daleks", after Romana answers several questions about the chemistry of concrete, the Doctor says she "would make a first class navvy". In the Gaelic Storm song "Don't Go for 'The One'", Tracey McCall is described as having "arms like a navvy and a face like dried fruit".
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