"I disagree. It suggests a line of attack, by thinking about clock-work. The device that burned your ship went off at the right time: the dead of night. The one in Mr. Threader’s carriage went off too early. I conclude that the device that was used ran too quickly in a moving carriage on a cold day, but ran at the correct rate sitting still in the belly of a ship’s hull. From that I can guess as to what sort of clock-work was used, which might help lead us to him who made the Infernal Devices."