Back when this thread was started I tried to find the following article. Finally found it. It's from 1906, just prior to the 1907 sling adoption. I don't think I posted this before, my memory is failing me. Pages 143 - 154.
https://www.google.com/books/edition/Jo ... frontcover
Krag leather slings - new
Re: Krag leather slings - new
Always thought Chesty invented use of the sling, the idea was probably stolen from him now that I think of it.