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Andrewgrantham.co.uk: Andrew Grantham | Various articles, mainly about railways Online

Andrewgrantham.co.uk: visit the most interesting Andrew Grantham pages, well-liked by users from USA, or check the rest of andrewgrantham.co.uk data below. Andrewgrantham.co.uk is a relatively well-visited web project, safe and generally suitable for all ages. We found that English is the preferred language on Andrew Grantham pages. Their most used social media is Facebook with about 92% of all user votes and reposts. Andrewgrantham.co.uk is built on WordPress and uses Apache HTTP Server.

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Denge sound mirrors | Sound Mirrors

This is the biggy. There is another similar mirror at Maghtab in Malta. Old photo The 30 foot sound mirror The 30′ dish still has the metal pole which a microphone would have been fixed to. The mirror...
Andrew Grantham | Various articles, mainly about railways

13 February 2017 Acoustic mirrors: how to find planes without radar, by Al Williams at Hackaday (“entertainment for engineers and engineering enthusiasts”): While today the acoustic mirror is a museum...

Sound Mirrors | Acoustic early warning systems, spectacular remnants of a dead-end technology on the British coast

Sound Mirrors Early warning sound mirrors A forerunner of radar, acoustic mirrors were built on the south and northeast coasts of England between about 1916 and the 1930s. The ‘listening ears’ were in...