Quote Originally Posted by breakeyp View Post
How do you measure this in production? Case depth requires the part to be cut in two, polished and dye etched and inspected with a microscope.
I would imagine that the process was developed by using just such a procedure as you describe, to arrive at a "recipe" that would achieve results in the desired range. A bit like firing "ranging shots", plotting the results, doing some fancy trigonometry, then going to "fire for effect".

And given the rather primitive nature of assessing the temperature of a component undergoing heat-tratment, before the advent of "modern" instrumentation, a fairly large "fudge factor" would have been employed. This may also partially explain the VERY specific note in the general specifications, that ALL steels used were to be "Carbon" steels, and that "alloy" steels could only be used after evaluation and approval by the "head shed" at Ordnance.
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