Note 320 — Chapter XIX · Boulton’s Application of the Steam-engine to Coining.

We find numerous letters from Boulton to Joseph Harrison relative to the execution of the presses, and the manner in which the various details of the work were to be carried out. On the 16th of January, 1788, he wrote,—“Push forward with the utmost expedition six of the cutting-out presses and one of the coining presses. I have engaged to have six of each kind at work by this day four months.... I shall be obliged to work after the rate of 1500 tons a year. I fear I must have eight presses [eight were eventually erected] in which case I must lengthen the building next the Gate road. Pray push forward, and be silent.” Various details as to the working of the presses and the execution of the coin were given in succeeding letters.