Another Winter Holiday Connection: Morse Code

I didn't include Morse code in my list of places our chapter of Winter Holiday took us because it wasn't mentioned in the passage I quoted. But it was mentioned in the chapter, most enticingly. The book opens with the two children, Dick and Dorothea, beginning to explore the farm they've come to visit. There's a big lake, and they see a boat with six children doing intriguing things around a large island in the middle of the lake. Readers of Swallows and Amazons know at once who these...