Hello again Drew, further on that "Burrard's Conversion" of tons to psi:
I am still unconvinced it applies to converting tons to psi pressure as reported in American sporting literature. Just this morning I was reviewing tech info on Winchester 21's and I read Jack O'Connor (1949) who stated again that 21's were proofed at 7-1/2 long tons which he also cited as 16,500 psi. That's a simple multiplication without the little known "conversion" ..... 7.5 (2200) = 16,500
As I'm sure you know, lead crushers became outmoded after electronic pressure measurement came into general use in the US after the War.
All told I ask if you are sure that Burrard's conversion applies to American pressure as stated in long tons, or if it solely relates to British proofing? Thanks in advance for your reply.
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