Hadrian's Wall

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Hadrian's Wall,

ancient Roman wall, 73.5 mi (118.3 km) long, across the narrow part of the island of Great Britain from Wallsend on the Tyne River to Bowness at the head of Solway Firth. It was mainly built from c.A.D. 122 to 126 under Emperor Hadrian and was extended by Emperor Severus a century later. The wall demarcated the northern boundary and defense line of Roman Britain. Fragments of the wall, 6 ft (1.8 m) high and 8 ft (2.4 m) thick, and many of the "mile stations" (stone blockhouses along the wall constructed every Roman mile) remain. Hadrian's Wall, which has been preserved, is one of the largest and most significant remains of the Roman occupation.
References in periodicals archive ?
In a cross sectional plane of the waveguide several unbalanced thin impedance vibrators (monopoles) are placed and a narrow slot is cut in the broad wall of the waveguide symmetrically relative to its longitudinal axis.
2] are coordinates of the vibrator mirror images, relative to the lower broad wall of the waveguide [4].
Si(2)] = 0, without decreasing a distance between the vibrators ends and the upper broad wall of the waveguide.
The surface current density, induced by classical and the proposed end launcher, on the broad wall of the aluminium and CFRP waveguides and on section [s.
Quantitative results of the maximum value of surface current density on the broad wall are presented in Figure 8 together with the values of reflection and transmission coefficients for the investigated systems.
In order to keep the waveguide losses to a minimum, a split body should have all waveguides split at the midpoint of the broad wall wherever possible, as symmetry of the TE10 mode ensures that no current crosses this boundary.
However, a slot shape that can be cut on the broad wall of a rectangular waveguide and be integrated into hat stiffener panels and provide full X-band coverage has not yet been reported in the literature.
In this paper, we show that a spiral slot cut into the broad wall of a WR-90 rectangular waveguide acts as a broad-band travelling wave radiator.
Those who stayed here nearly 5,000 years ago were probably more advanced than Their houses had broad walls for better security and their bricks were of different shapes," said Wazir Chand Saraoe, a 52- year- old school teacher, who had been collecting the relics as a child and has built a museum in his house.
For applications requiring broader operating bandwidth ridges are incorporated into the waveguide broad walls to form dual-ridged waveguide.