Here are the salvaged brake pieces compared to the book Daryl Demerchant dug up a while back (Nov. 21, 2003 post). I took quite a bit of time trying to illustrate what appears to be a match between our salvaged brake pieces VS actual technical brake specifications commonly found on steam locomotives of that era. The specs were from a book titled "Locomotive Engineering" published in 1908. Page 566 shows the brake specifications. These pieces were found at the sand mound.
I'm busy working on my blog posts. Watch this space!