Designed by I.K. Brunel, built at G. Lunell & Co., (Hotwells Dockyard) Bristol for the Bristol & Exeter Railway for use in Bridgwater Docks.
A steam scraper boat for clearing the dock of silt. An on board steam engine dragged boat along, and a vertical fixed blade mounted below the hull scraped the mud away.
Bertha is now preserved at Eyemouth.
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