I came across this interesting webpage I want to share here. It is the history of recumbents. Lots of photos and information are found here.
https://www.lightningbikes.com/riders/martin-krieg/recumbent-history/index.html
It was the photo below that influenced me when I built my first recembent bike. I considered using this steering setup on it, but went with a different type instead.
Here is what I built. I used two steering heads and connected them together with an adjustable connecting rod …
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Tadpole Rider 