Driftwood:
2-piper is correct. I don't think they knew what non-destructive testing was at the time and regarding the mark "Nitro Proof Oz Maximum", if a semi-smokeless powder was to be used, it had to develope a pressure between 80% and 100% over the service load. The Prussians for instance, for the provisional proof had a powder charge 3 times the service charge. The definitive proof had a powder charge 2 times the service load.
I think I recall that around 1937 Gutezeke(?) developed a piezoelectric device and I also think this technology was either developed between WWI & WWII or during the "ramp-up" time for WWII. It would be a quasi-direct method to measure applied stress where the Crusher Gauge was an indirect calculation of the realized force from the reduction in thickness of the plug or disc. I do not know if any used a piezoelectric device.
Kind Regards,
Raimey
rse
Last edited by ellenbr; 03/05/08 10:32 AM.
