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Until
1900, all dredging was done with bucket dredges. Lindon Bates considered that
the aging bucket dredge, Saurian, was totally inadequate and should be replaced
with the latest technology, an hydraulic or suction dredge. The RHB constructed
a temporary suction device, Elwood, for £14,259 and both dredges worked
constantly to keep pace with wall extensions.5 For the longer-term,
the board accepted Bates' own patented design for a state-of-the-art 'dredger'
like those he had recently supplied in the United States and Russia and one of
which was also being ordered for Brisbane.6
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