Classifier Instance:

Anchor text: Robert Stevenson
Target Entity: Robert_Stevenson_\u0028civil_engineer\u0029
Preceding Context: Since the early 19th century, lightships have used mushroom anchors, named for their shape, which typically weigh 3-4 tons. They were invented by
Succeeding Context: . The first lightvessel equipped with one was an 82-ton converted fishing boat, renamed Pharos, which entered service on 15 September 1807 near to Bell Rock and had a 1.5 ton anchor. The effectiveness of these anchors improved dramatically in the 1820s, when cast iron anchor chains were introduced (the rule of thumb being 6 feet of chain for every foot depth of water).
Paragraph Title: Mooring
Source Page: Lightvessel

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