Wow a question that I can answer on here!Next curiosity question. What were the other 3 Edinburgh grounds in 1939?
Royal Gymnasium- St Bernard's, claimed a capacity of 40k, the biggest attendance was I think 27,000 for a 2nd Division league game v Hibs (although the webmaster here rubbishes that in his book the roar of the crowd)
Meadowbank- Leith Athletic- I think this is the same as the current one off the top of my head, but Leith moved from Meadowbank to Old Meadowbank and back again (renaming it 'New' Meadowbank) around the 2nd world war. Incidentally I believe that Leith used at least 10 different 'home' grounds for league matches, which could well be a record.
City (or East Pilton) Park- Edinburgh City, easily the smallest venue, for easily the poorest league team from the city (if not Scotland). This ground still survived relatively untouched till the late 90's when the stand was knocked down. Still used by Spartans and Craigroyston for East of Scotland league games, although Spartans are due to move in the autumn across the street