Article: Thomas Barnes was appointed general editor in 1817. In the same year, the paper's printer James Lawson, died and passed the business onto his son John Joseph Lawson(18021852). Under the editorship of Barnes and his successor in 1841, John Thadeus Delane, the influence of The Times rose to great heights, especially in politics and amongst the City of London. Peter Fraser and Edward Sterling were two noted journalists, and gained for The Times the pompous/satirical nickname 'The Thunderer' (from "We thundered out the other day an article on social and political reform."). The increased circulation and influence of the paper was based in part to its early adoption of the steam-driven rotary printing press. Distribution via steam trains to rapidly growing concentrations of urban populations helped ensure the profitability of the paper and its growing influence.

Now answer this question: What kind of printing press helped increase the circulation and influence of The Times back in 1817?
steam-driven rotary printing press