Dock Pumping Station 1874: as well as serving to empty dry docks 5-8 when required, its accumulator tower provided hydraulic power for the adjacent cranes, capstans and caissons [REF].
A fifth dry dock (No 9) was added in 1895 on the north side of No 1 Basin, opposite the other four, to accommodate the new, larger battleships which were then under construction.