I recently read (and reviewed) Maurice Pommier's children's bookabout woodworking called GrandPa's Workshop. It's a charming book and it introduced me to the uniquely French tool called the besaigue. To a modern American woodworker's eyes, it's an odd, ungainly looking tool, but after hearing how it might be used, I've come to see how it could actually be useful in the right situation. A besaigue, pronounced as best as I can determine as Bay-say-gwe', is a long, double-tipped chisel, with a mortising chisel on one end, and a broad, flat chisel or firmer chisel on the other end. In the middle is a long rod with a handle attached at the midpoint. The purpose of the tool is for timber framing. The long end not being used is placed on the shoulder, and the handle is used to pare down or punch down into a beam to create a mortise. From other reading, it seems to have been commonly used up until perhaps the 17th century along with a large brace and bit to create round-ended mortise slots for structural timbers.
French Style besaïgue from the collection of the Ethnographic Museum of Geneva
What I didn't learn from this reading, however, is whether or how this tool was ever used in the English-speaking world.