I saw there one thing that interested me greatly. That was, the method of painting wire cloth. This was carried on in a large tower high enough to enable a twenty-yard length of the “cloth” to be suspended in it. This was taken through a tub of paint, and drawn slowly upward between three successive pairs of rollers, the last pair of india-rubber, held firmly together. By these the paint was squeezed into every corner, both sides were thoroughly painted, and the surplus paint removed, so that every mesh was clear, a uniform perfection unattainable by hand painting, and two boys would paint in ten minutes as much as a painter could paint in a day. I think this was an invention by Mr. Waters. With the completion of the engine for the Clinton Wire Cloth Company, the manufacture of the high-speed engine was closed for three years, from the spring of 1873 to the spring of 1876. This long rest proved to be most valuable. Looking back upon it, I have always been impressed with its importance at that very time to the development of the high-speed system. The design of the engine needed to be revised, and this revision involved study, to which time and leisure were essential. I had also an order from Elliott Brothers of London, to prepare a new and enlarged edition of the pamphlet descriptive of the Richards Indicator. I determined to make this a comprehensive book, embracing new information required by the steam engineer, so far as I knew it. This was published simultaneously in London and New York in the summer of 1874. I was enabled also to turn to account the report of the experiments of M. Regnault, which I had been at so much trouble to get, and with the help of English authorities to prepare and embody in this book Tables of the Properties of Saturated Steam, which the American Society of Mechanical Engineers honored me by adopting as its standard. I felt warranted in giving to this edition an amended title, as follows: “A treatise on the Richards Steam Engine Indicator, and the Development and Application of Force in the Steam Engine.” This also was a job requiring much time and undivided application. It is needless to say that without this long and entire rest from business neither of these tasks could have been undertaken. I found in the Astor Library a remarkable old book, entitled “Canon triangulorum,” published at Frankfurt in 1612, containing a Table of Natural Trigonometrical Functions, computed for every minute of arc, and extended to the fifteenth place of decimals. The column of versed sines enabled me to prepare tables _exhibiting_ the rates of acceleration and retardation of the motion of a piston controlled by a crank, neglecting the effect of the angular vibration of the connecting-rod. This effect was afterwards shown separately. For my treatment of this subject, I must refer the reader to the book itself.