Note 42 — Chapter IV · Thomas Newcomen—The Atmospheric Engine.

It has been stated that Newcomen took out a patent for his invention in 1705; but this is a mistake, as no patent was ever taken out by Newcomen. It is supposed that Savery, having heard of his invention, gave him notice that he would regard his method of producing a speedy vacuum by condensation, as an infringement of his patent, and that Newcomen accordingly agreed to give him an interest in the new engine during the term of Savery’s patent. It will, however, be observed that the principle on which Newcomen’s engine worked was entirely different from that of Savery.