Page:A Letter on the Subject of the Cause (1797).djvu/59

 enterpriſe;—and for an idea of this, I will refer your Lordſhip to the obſervations already made on ſtopping Engines. Juſt as wiſe, therefore, as when I ſtarted, I poſt back to Mancheſter, reſolved to make a Condenſer of ſome fort. I begin by reflecting, not on the thing, for I know not what it is, but on its reputation; and if I chanced to recollect the high encomiums it received in the Courts of Weſtminſter and London, I ſhould be led to conclude, that was my Engine all condenſer, I could not fail of being on the right ſide the queſtion. Thus I determine my condenſer ſhall be (what I have ſeen ſome made by Mr. Watt at the Soho, Birmingham) as large, or conſiderably larger than the ſteam cylinder of the Engine for which it is intended. This would be at leaſt twelve or twenty times the dimenſions of my Pump,—but ſay twelve times for the ſake of data; and ſuppoſe the Engine completed and ready for action. The conſequence of this I will endeavour to make plain to your Lordſhip. When the Engine has been emptied of her air, and alſo the condenſer, by what, Mr. Watt’s Engineers call blowing through; the ſteam valve is opened, and the piſton makes a ſtroke; then the diſcharge is made from the cylinder to the condenſer by opening another valve. Now