This silenced Isaac for a while, by forcing him to carry out immense recalculations. Daniel took unfair advantage of it to add: "Not long ago a new warship being built for the Tsar in Rotherhithe was burned by an Infernal Device, secreted in the recesses of the hull during the night-time. It used clock-work to shatter a phial containing white phosphorus, which, when the air touched it, burst into flame. Or so I have inferred from smelling its smoke, and sifting through the residue."