Thank you Eric..your post got me looking at the pic again.
At quick glance I mistakenly identified that machine as a cyl. grinder less the tailstock & modified for the specific task.
I was wrong - that is a honing machine..one built for deep hole work. As William pointed out, the barrels traverse left to right.
The stones can be adjusted as material is honed away..it appears he is making a stone adjustment to do just that in the photo.
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