It's about a Model B Ford engine head, from Literature Brings the Physical Past to Life, at Chronicle:
Let the dead French theorists lie. Instead, literary scholars can become guides to the physical reality of the past. If you think about it, that's what we've been doing in class for the last hundred years: explaining how to pronounce "Doth not Brutus bootless kneel?" in Early Modern English, for instance, or describing a Boeing B-17 to help students understand Randall Jarrell's poem "The Death of the Ball Turret Gunner." Once ordinary people note that we're doing something useful again, they might stop looking at us like we're nuts. And maybe we'll even get some jobs back.
Are the kids so uninformed that they don't know who a ball turret gunner is? Wish I had time now to discuss this essay, but I don't.