Still on the subject of the early steering, I adapted an old two speed hand drill to use as a steering box. The idea was to have steering from the normal wheel and also from the rear while being towed on a trailer. As the engine drive shaft was on the center line, the steering column was diverted around it via 1/4 drive universal joints and various extension bars.
The chuck ( removed ) end of the drill was extended with a welded in bar which just cleared the underside of the gearbox and protruded from the rear of the tractor. This would have been connected to a steering wheel on the trailer via another U/J and shaft. The drill winding handle / lever was connected to the track rod assembly with a short rod and swivel joints.
This all worked OK but had excessive free play, mainly due to back lash between the drill gears. I eliminated some of this by drilling, tapping and inserting 4BA adjusting screws in the case which pushed the two bevel gears closer together but couldn't do anything with the helical and spur gearing. After lots of work, trying to keep the U/J's and extensions at the minimum angle, allowing clearance, trying various setups etc and LOTS of head scratching, this arrangement was discarded. As it appears that operation from a trailer is the way to go a much simpler mechanism is being worked on. I have a new idea occupying the brain cell which MIGHT also enable steering from the correct position but would need a half size driver. The following photo's show part of this early set up.