Image talk:BridgeTaxonomyBW.png

I assume it's supposed to be "principal" forces? (spelling) -- Beland 05:36, 17 December 2005 (UTC)

The 'principle' spelling is correct. Ian Dunster 20:44, 18 December 2005 (UTC)

I too was confused by the use of 'principle' rather than 'principal'. Maybe the title should be reworded to be more clear.