Technicalities

The Irishman had just graduated from night school and was answering technical questions put to him by The Englishman and The Scotsman.
'How does The telephone work?' The Englishman asked The Irishman. The telephone,' said The Irishman, 'is like a big dog with his tail in Dublin and his head in London. When you step on his tail in Dublin, he barks in London.' That's a pretty good explanation,' said The Scotsman. 'Now tell me, how does The radio work?' The radio,' said The Irishman, 'is exactly The same as The telephone, but without The dog.'