The simplest plan is to start by listing historical events in a chronological table. Two parallel columns are used: the main influences forming public opinion on industrial policy appear in one column, so far as particular dated events can indicate these influences; dated instances of State action, such as the main legislation, judgments and orders affecting industry, appear in the parallel column. To give some measure of the relative speed with which events unfolded, horizontal lines are drawn across the vertical columns to mark each decade from 1830 onwards. By 1817 the long Napoleonic War and its aftermath had ended and the date forms a convenient start for peaceful, post-war developments.