The world's greatest ground? A photographic centenary celebration of Highbury
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18. Wire in the mud
24 April 1964: While Britain goes bonkers with Beatlemania, Arsenal play it sensible by pioneering the use of undersoil (or "under-turf" as the diagram would have it) heating.
Thirty miles of electric cables were laid in trenches six inches under the surface of the pitch – and an area approximately 7ft outside the touchlines, which is good news for keeping the linesman's toes toasty.
The installation cost Arsenal £10,000 - equivalent to £171,000 in 2013 - but it didn't last long, as it was replaced in 1970… the years the Beatles split up. Coincidence? We think so.