Roy Underhill had a long running series on PBS. First started in 1979 it was titled " The Woodwright's Shop" and covered traditional woodcraft, before the onslaught of modern power tools. Roy's woodwright was a "jack-of-all-trades". Throughout the series and in the five books published on the series, Roy takes you through the historical and hands-on aspects of building, construction, and workshop, from blacksmith work to cutting out and putting up a timber frame building and everything in between. As far as working knowledge goes, I see Roy's character and the Grandpa character in "A Book Of Country Things" as being very close, they certainly worked with similar tools.
Five books were published on the series, I have four. I am missing the second volume in the series, I'll find it one day, ha, ha. I will revisit these volumes at a later date, but today I am focused on treadle lathes.
In the third volume "The Woodwright's Work Book", Chapter 4 covers the history and development of the wood turning lathe.
Roy wanted to build a colonial era wood turning lathe. On a visit to Colonial Williamsburg, Roy took a picture of an actual colonial era treadle lathe, housed there. His intention was to reproduce it. (Check out the pavers on the floor. If I get tired of the patio stones I used in my ventilated shop space, this is my preferred option. "Canadian Workshop" magazine did an article years ago, on a guy who did this with his large workshop. Looked great.)
Here is a picture of Roy turning a spindle on his reproduced treadle lathe.
Here are two measured drawings of Roy's fine reproduction of the colonial era treadle lathe.
Check back this afternoon for two pdf plans of treadle lathes. One is a reproduction of Roy's reproduction. Of course these are 95% wood construction, as opposed to the all metal construction of the modern version, in the previous post.