What is "singletrees"

Usage examples of "singletrees".

I wondered who among the Dkota knew about singletrees and eveners, or recognized the potential in a roof beam and a pair of wheels.

And I notices that the folks that brings it up aint even Edmondses:” whereupon the white man even as he sprang up reached blindly back where on the counter behind him lay a half-dozen plow singletrees and snatched one of them up and had already started the downswing when the son of the store’s proprietor, himself a youngish active man, came either around or over the counter and grasped the other so that the singletree merely flew harm­lessly across the aisle and crashed against the cold stove.