The main tower is 50 100 m high.
We assume that the primary transmitter (TV tower, etc). is stationary and the position of secondary users can be estimated by existing positioning algorithms [28 32].
Each radar has two arrays of 50-foot antenna towers; the primary array consists of 16 towers, and the secondary, interferometer array consists of four towers.
The primary contractor for the tower was Andrew Handyside and Company, based in Derby.
Wind tunnel experiments have shown that the primary effect of the upwind tower is to retard the flow separation on the top and sides of the downwind tower, provided the separation distance between the twin tower models is less than the building height (L/H<1.0).
The greatest risk would be on the ground, he said, because of the possibility that the airport's runways would not be entirely clear of maintenance and other vehicles, which is among the primary functions of the control tower.
Cantor Fitzgerald, the biggest broker of American Treasury bonds, was located at the top of one of the towers, and the primary futures market for these securities was based in another building at the bottom of the centre that was also destroyed.
A written statement from the jury's chairman, Vartan Gregorian, president of the Carnegie Corporation of New York, said the winning design "has made the gaping voids left by the towers' destruction the primary symbol of loss," resulting in "a memorial that expresses both the incalculable loss of life and its regeneration".
The primary fire-control director atop the conning tower was protected by an armoured hood.
In his introduction to the 2003 revised edition of his novel The Dark Tower: The Gunslinger, Stephen King revealed that the film was a primary influence for the Dark Tower series, and that Eastwood's character specifically inspired the creation of King's protagonist, Roland Deschain.
Fire towers are staffed almost continuously from late June to mid-September— the primary fire season.
