I have a hard copy of the book, it doesn't really have much about the cameras and shutters.
The US importer of T-P shutters was Burke & James, they seemed to have preferred the Aluminium bodied versions, and few survive. The Aluminium alloy they used corrodes. I have similar corrosion issues with aluminium bodied parts on pre-WWII cameras.
About 5 years ago I had a chance to buy a 10x8 Thornton Tourist camera in amazing condition but missing its lens board, it had a prototype roll film back.. Thornton was a genius but lacked any business acumen, this particular Tourist camera was made by Billcliffe in Liverpool, before the Pickard family bailed him out. For many years John Thornton lived a meager existence in the US, living on Patent royalties from Kodak, mostly for his film pack design and early colour cine film.
Back to the Tourist camera, you need to see one fist hand, the 10x8 early version had a large rotating circular lens board holding 3 different FL lenses. I don't think the idea was to have all the lenses attached, rather you rotated to the flange for a particular lens.
I have two prototype T-P roller blind shutters. I must finish my current commitments, then get writing, oh and printing
Ian