In 1683, a little before Papin, Sir Samuel Morland, Master of Works to Charles II., wrote a treatise on the “Élévation des Eaux par toutes sortes de Machines,” &c., with four pages appended to it called “The Principles of the New Force of Fire, invented by Samuel Morland in 1682, and presented to His Most Christian Majesty in 1683.” In this work (still in MS. in the Harleian Collection of the British Museum), it is stated that “water being converted into vapour by the force of fire, these vapours shall require a greater space (about 2000 times) than the water occupied, and sooner than be constantly confined would split a piece of cannon.” It is remarkable that, so long before careful experiments had been made on the expansibility of water when converted into vapour, Morland should have given so near an approximation to the true amount (about 1750 times). [Sidenote: Savery.] Thomas Savery, one of the most ingenious men of the age in which he lived, proposed (1696) a mode of raising water and occasioning motion “to all sorts of mill-work by the impelling force of _Fire_,” adding,[35] “it may be very useful to ships, but I dare not meddle with that matter, and leave it to the judgement of those who are the best judges of maritime affairs.”[36] In 1697, Papin (whose own invention had proved a failure) used Savery’s engine, which had been greatly improved by Newcomen in 1705 to propel a _steam-boat_ on the Fulda.[37] In that year, too, Papin proposed to drive a vessel by paddle-wheels turned by the stream, and by boat-hooks which somehow pushed against or griped the bottom.[38] Chabert, in 1710, described a vessel with large paddle-wheels working in troughs cut through the hull;[39] and, in 1721, we read of a galley built in France with revolving oars fastened to a drum or wheel with paddle-vanes on hinges, capable of being set to any angle, and of being worked by 200 men, the galley having three of these wheels on each side.[40] John Allan, in 1722, proposed a mode of navigating a ship, “by forcing water or some other fluid through the stern or hinder part, at a convenient distance under the surface of the water, into the sea, by proper engines placed within the ship.” He also proposed, as Papin had previously done, a machine with the power of “firing gunpowder _in clauso_,” with the view of navigating a ship in a calm.[41] [Sidenote: Jonathan Hulls.] In 1736, Jonathan Hulls made some practical progress in the idea so long floating vaguely in the minds of his predecessors, and, on the 23rd December of that year, secured a patent for his invention “of a machine for carrying ships and vessels out of or into any harbour or river against wind and tide or in a calm,” of which the following is a sketch. [Illustration]