'Indeed I did!' laughed Archie. 'Oh, it's not so difficult, after all. See, I'll show it to you. It's only made with pins set round in a circle on a piece of board, with a nail on a pivot in the centre to revolve round and strike them. The hard part of it was to set the pins just right. You see, the shortness or longness of them makes the difference in the notes, and the distance between gives the time. It took me a jolly long while to puzzle it all out, I can tell you!'