Page:A Letter on the Subject of the Cause (1797).djvu/50

 gravitating force. This will defeat a falſe poſition your Lordſhip heard advanced by one of the evidence called by the Defendants; I mean Mr. Gitty, who, if I heard right, on being aſked if he could contrive to rid the condenſer of this water and vapour as in Newcomen, anſwered, he thought he could, by continuing the eduction pipe as low or lower than until its leg filled with water, would overbalance the greateſt preſſure of the atmoſphere. This poſition I admit as far as relates to water, bur as to diſcharging any matter which becomes volatile in water, I think I may venture to ſay, without traducing the merits of that reſpectable evidence, is out of his power, or that of Mr. Watt, or any perſon ever created, ſimply on the principle of Newcomen. This I will endeavour to make appear to your Lordſhip.

In theſe Condenſers, is always intended to be maintained a conſtant vacuum, while the Engines work; and as much as they fail in this, the Engines are incomplete. This is a ground work which I underſtand is laid down by Mr. Watt, who admits this perfection to be neceſſary to the operation of the machine. Suppoſe then the vacuum, in this caſe, to