three motions, to the right, the left, and down in front. To the right means one, to the left means two, and down in front means three. Now all the letters are represented by combinations of numbers, and all you have to do is to learn the combinations and spell ahead. It's easy enough when one gets the hang of it. At night you can use a lantern instead of a flag."
"That is easy," commented Walter. "But what about those signals at the masthead. Can you read those?"
"No. In those, most every flag represents a letter, or a word, or sentence; but to read the signal you have got to have either the international signal code-book, or else the United States Navy code-book. The navy code is locked up in the captain s cabin, and the book is weighted with lead, so that if anything happens, it can be heaved overboard and sunk, thus keeping it out of the enemy's hands."
"I declare, signalling isn't so difficult, after all," cried Walter. "To me it looked like a perfect jumble."
"The trouble with flags is, that when there's no wind they won't straighten out so you can see
