"Such delicate things need delicate treatment. Put in some of the needful, Muller."
The shorter man fumbled in his pocket for some time, and then produced a small paper packet. He opened this, and took out of it half a handful of whitish granules, which he poured down through the hole. A curious clicking noise followed from the inside of the box, and both men smiled in a satisfied way.
"Nothing much wrong there," said Flannigan.
"Right as a trivet," answered his companion.
"Look out! here's some one coming. Take it down to our berth. It wouldn't do to have any one suspecting what our game is, or, worse still, have them fumbling with it, and letting it off by mistake."
"Well, it would come to the same, whoever let it off," said Muller.
"They'd be rather astonished if they pulled the trigger," said the taller, with a sinister laugh. "Ha, ha! fancy their faces! It's not a bad bit of workmanship, I flatter myself."
"No," said Muller. "I hear it is your own design, every bit of it, isn't it?"
"Yes, the spring and the sliding shutter are my own."
"We should take out a patent."