To be and to continue being a Cog: the conservation of the Bremen Cog of 1380
Per Hoffmann
The conservation project for the Bremen Cog of 1380 took 38 years from salvage to presentation ship public in Deutsches Schiffahrtsmuseum 2000. was salvaged River Weser about 2000 pieces, and stored water tanks. A new museum built, reassembled waterlogged timbers. reconstructed with most weight being taken by ceiling hall via a steel-rod hanging system. Then tank built around hull, novel two-step PEG-treatment applied, especially developed Cog. In two consecutive baths PEG 200 3000 stabilized lesser degraded heavily wood against shrinkage, splitting, warping. After cleaning, looks dark brown, dry, natural. extraordinary is regarded success.
International Journal of Nautical Archaeology