One centering was used for the two arch rings, supported on dwarf walls which formed a slipway, along which it was moved after the first arch was built.
There is a repairing slipway accommodating vessels of Boo tons.
In 1888 the gates of Wellington dock were widened to admit a larger type of Channel steamers; new coal stores were erected on the Northampton quay; the slipway was lengthened 40 ft., and widened for the reception of vessels up to 800 tons.
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