Wow! What a fascinating piece of kit. I know of a modern company making a driveshaft similar to this but I had no idea this was on bikes 120 years ago. Plus the rear suspension it was truly ahead of it's time!

I would've appreciated more close up shots of the interfacing mechanism between the drive shaft and pedals/back wheel

the stability at the front shouldn't be too good considering the steering tube angle is going behind the tire contact point (yes i have no idea what im talking about)