Read it through once

While I was trying to think out what kind of a game this might be, and how a stranger might best go to work to beat it, a sailor came in and pulled out the ‘Empty’ end of the first slat and put it back with its reverse side to the front, marked ‘Full.’ He made some other change, I did not notice what. The slat-frame was soon explained. Its function was to indicate how the ballast in the ship was distributed. The striking thing was, that that ballast was water. I did not knew that a ship had ever been ballasted with water. I had merely read, some time or other, that such an experiment was to be tried. But that is the modern way; between the experimental trial of a new thing and its adoption there is no wasted time, if the trial proves its value.