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Barbed wire - Wikipedia ... Barbed wire
The barbed wire strands on the top of the signal fence activated an alarm when pulled or cut, alerting the border guards. The signal or "hinterland" fence (Signalzaun) was the first of the border fences, dividing the Sperrzone from the more heavily guarded protective strip (Schutzstreifen) adjoining the actual border.
It is a natural building technique developed from historic military bunker construction techniques and temporary flood-control dike building methods. The technique requires very basic construction materials: sturdy sacks filled with organic material usually available on site. Standard earthbag fill material has internal stability.
Wire obstacle. In the military science of fortification, wire obstacles are defensive obstacles made from barbed wire, barbed tape or concertina wire. They are designed to disrupt, delay and generally slow down an attacking enemy. During the time that the attackers are slowed by the wire obstacle (or possibly deliberately channelled into ...
Dragon's teeth (fortification)
Concertina wire - Wikipedia ... Concertina wire
Signature. Jacob Haish (March 9, 1826 – February 19, 1926) was one of the first inventors of barbed wire. His type of barbed wire was in direct competition with the other barbed wire manufacturers in DeKalb, Illinois. He was a known carpenter and architect in DeKalb County and designed several prominent DeKalb homes. [1]
Joseph Farwell Glidden (January 18, 1813 – October 9, 1906) was an American businessman and farmer. He was the inventor of the modern barbed wire. In 1898, he donated land for the Northern Illinois State Normal School in DeKalb, Illinois, which was renamed as Northern Illinois University in 1957.