They were not co-laborers; they were not even compatriots, nor contemporaries. Worcester was an Englishman and Orffyreus a Frenchman, though most of his labors were in what is now Germany. The former died thirteen years before the latter was born. Edward Sommerset, of England, Sixth Earl and Second Marquis of Worcester, was born in the year 1601, and died in 1667. He was famous not only for his noble birth and family rank, but for personal attainments. He was the author of a work entitled "Century of Names and Scantlings of Such Inventions as at Present I Can Call to Mind Have Tried and Perfected" (1663), which has often been reprinted, and is usually referred to simply as "Century Inventions." He was very prominent in public life; was greatly interested in mechanical experiments, and made valuable suggestions, inventions and improvements in connection with the use of steam as a motive power. Henry Dircks, who is so frequently mentioned in this book, wrote a book which was published in 1865, entitled "Life, Times and Scientific Labors of the Second Marquis of Worcester." The Marquis appears to have been all his life greatly interested in science, mechanics and mathematical contrivances. His first wife died in 1635, and it seems probable that thenceforth he became and remained more than ever devoted to mechanics, and sometime after that period announced a successful Perpetual Motion machine, the gist of all known information concerning which appears from the articles and discussions hereinafter set forth in this chapter. Jean-Ernest Eli-Bessler (Councillor) Orffyreus was born in 1680, near Zittan, Alsace, France. He was a man of great ability and attained an eminent place in public life. The title "Councillor," he acquired by having been selected Councillor to the Prince of Hesse Castle. The best information concerning him indicates that he was of very erratic temperament, given to fits of melancholy and extreme anger. In early life he was a student of theology and medicine, but his penchant was really for mechanics. He claimed that in his search for whatever might prove curious and valuable he had discovered Perpetual Motion, and that between the years 1712 and 1719 he had made two successfully working machines on his system. The following discussions disclose all that is known of the claimed inventions of these two distinguished Perpetual Motion workers. The alleged inventions of the Marquis of Worcester is stated by him in the 56th article of his book entitled "Century of Names and Scantlings of Such Inventions as at Present I Can Call to Mind to Have Tried and Perfected," and translated from the ancient English style in which his book is written into modern style of English, reads as follows: The inventor offers the accompanying sketch, with description of an Hydraulic Mover, for communicating power to machinery, and recently invented by him:--