...or, more precisely, guestimates, based roughly on the size of the telephone. edit: what Anna said. If you look at the picture see if you think my description was at all close !
I have the book in front of me; I'm just puzzled about what that third thing is on the desk. Maybe it's a dangling pen? edit: what Bill said (There isn't an ink bottle until six pages later.)
Actually it looks most like the pendulum you can use to trace pretty patterns in a tray of sand, except that the string is too short and there isn't any sand either... Besides, I doubt they would have put a Lissajous generator into a children's book!
