Mark,
I'm surprised you didn't recognize Harry riding one of his uncle's Pope bicycles. smirk
Seriously, if Tom Rowe ever gets the Pope book finished you will see that most of his machinery is still alive and well living 10 miles from me in southwest Wisconsin. Above most of the machines there is a photo of Pope using them. The most interesting to my eyes is the rifling cutter. The mechanism that provides for gain twist is extremely simple.