These are examples of barbed wire fencing used as “concertina” wire in the European campaign during World War I. The twisted steel wire with barbs at regular intervals impeded or halted the passage of soldiers.
This fencing consists of folded single strand links with ends joined in center by double wrapping wire to form a two point barb.
Each link is connected to the next to form a flexible chain. This is a variation of machine patent 292,408, Jan. 22,...
This fencing is flat ribbon wire with two-point lance point-applied barb. It is a variation of the Brinkerhoff Winged Saber Point, patent number 214,095, April 8, 1879, by Jacob Brinkerhoff, Auburn, New York.