In 1793, Fulton was engaged in a project to improve inland navigation. Even at that early day it appeared that he had conceived the idea of propelling vessels by steam, and he speaks in his letters of its practicability. In 1794 he obtained from the British Government a patent for improvements in canal locks, and his pursuits at this time appear to have been in this direction. In his preface to a description of his Nautilus, or "plunging" boat, a species of submarine boat, he says that he had resided eighteen months in Birmingham where he acquired much of his knowledge of mechanics. In later years, when in Paris, Fulton sent a large collection of his manuscripts to this country. Unfortunately, the vessel in which they were sent was wrecked, and, while the case was recovered, only a few fragments of the manuscripts could be used. It is owing to this misfortune that we have so few records of Fulton's work at this time. [Illustration: Birthplace of Robert Fulton.[1]] [Footnote 1: This illustration and the four following are from Knox's "Life of Fulton," reproduced by permission of the publishers, G.P. Putnam's Sons.] We know, however, that in 1794 he submitted to the British Society for the Promotion of Arts and Commerce an improvement of his invention for sawing marble, for which he received the thanks of the society and an honorary medal. He invented also, it is thought, about this time, a machine for spinning flax and another for making ropes, for both of which he obtained patents from the British Government. A mechanical contrivance for scooping out earth to form channels for canals or aqueducts, which is said to have been much used in England, was also his invention. The subject of canals appears to have chiefly engaged his attention during these years of the end of the century. He called himself a civil engineer, and under this title published his work on canals, and, in 1795, many essays on the same subject in one of the London journals. He recommended small canals and boats of little burden in a treatise on "Improvement of Canal Navigation," and inclined planes instead of locks, as a means of transporting canal boats from one level to another. His plans were strongly recommended by the British Board of Agriculture. Throughout his course as civil engineer his talent for drawing was of great advantage to him, and the plates annexed to his works are admirable examples of such work. He seems to have neglected his painting till a short time before his death, when he took up the brush again to paint some portraits of his family. During his residence in England he sent copies of his works to distinguished men in this country, setting forth the advantages to be derived from communication by canals.