Thank you John and Jason for taking the time answer my email.
I am in Toronto but would dearly love to visit Greenwich and see these clocks for myself.
It appears that the plans for the Pratt clock can be found in the Model Engineer series beginning in 2004, and if I purchase issues 4235,4237, 4239, 4241 and 4243 I will then have a complete set of plans. I assume that if I purchase an electronic subscription to the publication I can then download and print them.
Again, thank you for you response.
Best regards,
terry