“Still less will it be forgotten that this engine, whose initial velocity as it left the mouth of the monster cannon had been erroneously calculated, had flown off at a speed exceeding by sixteen times that of ordinary projectiles — or about four hundred and fifty miles an hour — that it did not fall to the ground, and that it passed into an aerolitic stag, so as to circle for ever round our globe.    From Wordnik.com.  [Robur the Conqueror] Reference

"Still less will it be forgotten that this engine, whose initial velocity as it left the mouth of the monster cannon had been erroneously calculated, had flown off at a speed exceeding by sixteen times that of ordinary projectiles -- or about four hundred and fifty miles an hour -- that it did not fall to the ground, and that it passed into an aerolitic stage, so as to circle for ever round our globe.    From Wordnik.com.  [Robur the Conqueror] Reference