The basic technology of fencing has not changed for 150 years. It is still the barb which provides the deterrent and does the damage. Here is some history about the development and use of barbed wire in peace and in war: http://en.wikipedia.org/wiki/Barbed_wire _MG_3626.jpg You can buy a copy of this image as a card or print at http://alexhowen.redbubble.com/sets/62091/works/5381189-1-the-barb
Copyright Alexander Meysztowicz-Howen