Industrial techniques and steam-power was introduced to coin manufacture by Matthew Boulton in Birmingham in 1788. By 1786, two-thirds of the coins in circulation in Britain were counterfeit, and the Royal Mint responded to this crisis by shutting itself down, worsening the situation. The industrialist Mathew Boulton turned his attention to coinage in the mid-1780s as an extension to the small metal products he already manufactured in his factory in Soho. In 1788 he established a Mint as part of his industrial plant. He invented a steam driven screw press in the same year (his original machinery was being used at the Royal Mint until 1881, almost a century later), which worked by atmospheric pressure applied to a piston. The piston was in communication with a vacuum vessel from which the air had been pumped by steam power.