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Re: Early M73 Breech Blocks
Posted by Dick Hosmer on Tuesday, 9 October 2012, at 3:01 p.m., in response to Early M73 Breech Blocks, posted by Al Frasca on Tuesday, 9 October 2012, at 1:25 p.m.
Great picture, Al. And, thanks for the nod, but I'm sure it had been noted before - perhaps I was simply the first to comment here.
Something I had not noticed - but which is clear in the pics, is the amount of metal remaining between the camlatch plate mortise and the rear end of the arch - varying (in the selected examples) from nearly tangent to what looks like a good 1/16". I'd guess that this represents tolerance in milling the arch, rather than an evolutionary change, but, perhaps that is ANOTHER little tidbit - not unlike the thumb-piece notch variations which you discovered a few years ago?
Wonder if the really early blocks (top) represent the completion of partially-milled 1870 blocks, left over at time of change?
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