The Lunar Circle also attracted more distant involvement. Joseph Priestley, then living in Leeds and a close friend of John Mitchell, became associated with the Society in 1767 when Darwin and Wedgwood became involved with his work on electricity. In the same year James Watt visited Birmingham on the recommendation of his business patron John Roebuck, being shown around the Soho Manufactory by Small and Darwin in Boulton's absence. Although neither Priestley nor Watt were to move to Birmingham for several years, both were to be in constant communication with the Birmingham members and central to the circle's activities from 1767.