{"version":"1.0","type":"link","title":"Caisson lock - Newikis","description":"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…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400,"thumbnail_url":"https://upload.wikimedia.org/wikipedia/commons/c/c3/Coombe_Hay_Lock.png","thumbnail_width":684,"thumbnail_height":624}