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Bascule chambers are large, closed spaces low down inside each of Tower Bridge's two main towers. In shape they're each like a 90-degree segment cut out of a millstone and stood on edge, about 50 feet high and perhaps 60 feet wide. They accommodate part of the roadway which tilts down into the space when the bridge is raised. You can hear traffic passing overhead and water splashing onto a tarpaulin. 2 x DPA 2006C mics, Sound Devices MixPre-D preamp and Sony PCM-M10 recorder. Many thanks to Mark Peter Wright for accompanying me, and to Chris Earlie of the Tower Bridge Exhibition (http://www.towerbridge.org.uk) for his kind permission and enthusiasm in allowing me to make this recording. Lots more London sounds and related stuff on the London Sound Survey website http://www.soundsurvey.org.uk.