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Old October 22nd, 2005, 09:42 PM   #1
Obelixx
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Join Date: Apr 2005
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The two metal-free wooden towers of aerial test facility Brück

The aerial test facility Brück is a facility for antenna measurements established in 1939 by Telefunken. The buildings of aerial test facility Brück served from 1945 to 1957 as dwelling for war refugees (still today some building foundations and shelter remainders are present on the area). In 1956 the German Post begun there again to build up a facility for antenna measurements. One started with the construction of three large metal-free wood towers. They serve and served for the assembly of antennas, from which the radiative pattern is measured. Because metallic parts would disturb these, the towers had to be built of wood, without any metallic parts.
One of the three towers, the such called "Messturm I" burned down on April 20th,1979 and was not rebuilt, so there are only two wood towers.


Messturm II ( http://en.structurae.de/structures/d...fm?id=s0010788 and http://skyscraperpage.com/diagrams/?b41640 )
This 54 meters high tower was built in 1963. The wood of the tower was impregnated with a non conductive acidless chemical substance. As connection elements layer compressed wood pins and wooden nuts and mothers are used, because the tower had to be implemented metal-free. The rope, which lead from the top of the tower to the ground, serves as lightning conductors. It can be rapidly removed by means of hoists.


Messturm III ( http://en.structurae.de/structures/d...fm?ID=s0010787 and http://skyscraperpage.com/diagrams/?b41641 )
This double tower was built in 1963. It is also 54 meters high and is from the same construction type as Messturm II. It serves for all kinds of investigations of larger antennas. The bridge, which connects both towers, is 35 meters long and 5 meters wide. One recognizes the easily removable lightning conductor ropes.
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