A Conversation for Roman Roads and Bridges
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Vestboy II not playing the Telegram Game at U726319 Started conversation Oct 28, 2003
Good article! BTW When you mention the roads being higher in the middle of course this is still the situation - it is called the camber.
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Pimms Posted Oct 28, 2003
Neat entry 
The only bit I had trouble with was visualizing what was meant by the hexagon of tree-trunks. I imagine what is meant is a cofferdam, with tree trunks sunk as pilings, and a hexagonal cylinder built up before water pumped out. Is that right?
Pimms 
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Researcher 239363, (Mandy) Posted Oct 28, 2003
I think that you have the right idea, except that I have no idea what a cofferdam is, so i can't be completely sure.
Mandy 
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Pimms Posted Oct 29, 2003
'roman cofferdam' in google search turns up a few sites
http://www.glendale-h.schools.nsw.edu.au/faculty_pages/ind_arts_web/bridgeweb/bridge_history_timeline.htm - has a little image of a bridge with a hexagonal cofferdam pier
or http://www.britannica.com/ebc/article?eu=386393 defines cofferdam
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