During his residence in Wales a hyper-Calvinistic work entitled A Body of Divinity; or the Sum and Substance of the Christian Religion, was published under his name by John Downham; and, although he repudiated the authorship in a letter to the editor, stating that the manuscript from which it was printed was merely a commonplace-book into which he had transcribed the opinions of Cartwright and other English divines, often disapproving of them and finding them dissonant from his own judgment, yet it has been persistently cited ever since as Usher's genuine work, and as lending his authority to positions which he had long abandoned, if he ever maintained them.
En 1767 Hargreaves produced the spinning-jenny; Arkwrights;pinning machine was exhibited in 1768; Cromptons mule was ~inished in 1779; Cartwright hit upon the idea of the power,oom in 1784, though it was not brought into profitable use till The Staffordshire potteries had been flourishing under Wedgwood SinCe 1763, and the improved steam-engine was brought into shape by Watt in 1768.
There he became an adherent of Thomas Cartwright (1535-1603), and publicly expounded his presbyterian views, with the result that he was obliged to leave Cambridge without taking his degree.
He next followed Cartwright to Antwerp, and, having received ordination according to rite of the Reformed church, assisted Cartwright for several years in preaching to the English congregation there.
Against the Puritan governments of New England, among them Massachusetts' extension of its jurisdiction over the towns of Maine and New Hampshire, the persecution of the Quakers, and the denial of the right of appeal to the crown, and in 1664 a royal commission, consisting of Richard Nicolls, Samuel Maverick, Robert Carr and George Cartwright, was sent over to settle disputes and secure some measure of imperial control, but Massachusetts, the chief offender; successfully baffled all attempts at interference, and the mission was almost a complete failure.