Below you see the remarkable steering system of Frank Easton. It is a progressive steering system. It means that when you turn it 10 degrees near center it will give less deflection than when you turn it 10 degrees further when near the outer limit. This way you can steer very lightly when small steering corrections are needed. Go see the very detailed page on the French Pouguide.org site about this steering system.
Seems that tests with trigear were also done.
If you want to read more about the American Flying Flea history of Henri Mignet. Go see Pou Renew edition 45.