Maeslantkering
Videos
The Maeslantkering 'Maeslant barrier' is a storm surge barrier on the Nieuwe Waterweg, in South Holland, Netherlands. It was constructed from 1991 to 1997. As part of the Delta Works, the barrier resp
The Maeslant Barrier seen from the north
A ship passing the barrier
Model (no longer present)
The Maeslantkering closed
Green Bank Telescope
Videos
The Robert C. Byrd Green Bank Telescope in Green Bank, West Virginia, US is the world's largest fully steerable radio telescope, surpassing the Effelsberg 100-m Radio Telescope in Germany. The Green B
Maeslantkering
…width (360 metres) of the Nieuwe Waterweg, the main waterway of Port of Rotterdam. It is one of the largest moving structures on Earth, rivalling the Green Bank Telescope in the United States and the Bagger 288 excavator in Germany. The construction of the Maeslantkering was a part of the Europoortkering project which…
The Green Bank Telescope
The Robert C. Byrd Green Bank Radio Telescope (GBT) has a collecting area of 2.3 acres (0.93 ha) which focuses the radio waves falling on it onto sensitive receivers at the top of the boom attached to the side.
Actuators (black) under the surface panels for surface fine-tuning
Gregorian focus operation: subreflector (top), rectracted boom (middle), and receiver turret (bottom)