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In 1711, this engine was introduced into mines for pumping purposes. Whether its action was originally automatic or whether dependent upon the hand operation of the valves is a question of doubt. The story commonly believed is that a boy, Humphrey Potter, in 1713, whose duty it was to open and shut such valves of an engine he attended, by suitable cords and catches attached to the beam, caused the engine to automatically manipulate these valves. This device was simplified in 1718 by Henry Beighton, who suspended from the bottom, a rod called the plug-tree, which actuated the valve by tappets. By 1725, this engine was in common use in the collieries and was changed but little for a matter of sixty or seventy years. Compared with Savery's engine, from the aspect of a pumping engine, Newcomen's was a distinct advance, in that the pressure in the pumps was in no manner dependent upon the steam pressure. In common with Savery's engine, the losses from the alternate heating and cooling of the steam cylinder were enormous. Though obviously this engine might have been modified to serve many purposes, its use seems to have been limited almost entirely to the pumping of water.

Thus it happened, that after Sir James had ridden rather fast for half an hour in a direction away from Tipton Grange, he slackened his pace, and at last turned into a road which would lead him back by a shorter cut. Various feelings wrought in him the determination after all to go to the Grange to-day as if nothing new had happened. He could not help rejoicing that he had never made the offer and been rejected; mere friendly politeness required that he should call to see Dorothea about the cottages, and now happily Mrs. Cadwallader had prepared him to offer his congratulations, if necessary, without showing too much awkwardness. He really did not like it: giving up Dorothea was very painful to him; but there was something in the resolve to make this visit forthwith and conquer all show of feeling, which was a sort of file-biting and counter-irritant. And without his distinctly recognizing the impulse, there certainly was present in him the sense that Celia would be there, and that he should pay her more attention than he had done before.

It is certain that sedentary, and within-door arts, and delicate manufactures (that require rather the finger than the arm), have, in their nature, a contrariety to a military disposition. And generally, all warlike people are a little idle, and love danger better than travail. Neither must they be too much broken of it, if they shall be preserved in vigor. Therefore it was great advantage, in the ancient states of Sparta, Athens, Rome, and others, that they had the use of slaves, which commonly did rid those manufactures. But that is abolished, in greatest part, by the Christian law. That which cometh nearest to it, is to leave those arts chiefly to strangers (which, for that purpose, are the more easily to be received), and to contain the principal bulk of the vulgar natives, within those three kinds, - tillers of the ground; free servants; and handicraftsmen of strong and manly arts, as smiths, masons, carpenters, etc.; not reckoning professed soldiers.

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