Papin was, however, a man of great perseverance; and, strong in his faith as to the power of steam to propel ships, he gradually worked his way to the contrivance of a model steamboat. When in London, he had seen an experiment tried by the Prince Palatine Rupert on the Thames, in which a boat fitted with revolving paddles attached to the two ends of an axle which received its motion from a trundle working on a wheel turned round by horses, went with such rapidity as to leave the king’s barge, manned by sixteen rowers, far behind in the race. The idea which occurred to Papin was, to apply a steam machine to drive the paddles, and thus ensure a ship’s motion independent of wind or tide. For this purpose, it was necessary to convert the alternate motion of the piston-rod into a continuous rotary one; and this he proposed to effect “by having the rods of the pistons fitted with teeth, which would force round small wheels, toothed in like manner, fastened to the axis of the paddles.”
ANCIENT PADDLE-BOAT.
The use of paddle-wheels in propelling boats had long been known. The Harleian MSS. contain an Italian book of sketches, attributed to the fifteenth century, in which there appears the annexed sketch of a paddle-boat. This boat was evidently intended to be worked by two men turning the crank by which the paddles were made to revolve. There were many other early schemes of paddle-boats, some of which were proposed to be worked by horse-power. The name of Blasco Garay has often been mentioned as the first who applied the power of steam to the driving of paddle-boats; but for this there is not the slightest foundation. M. Bergenroth informs us that he has carefully examined all the documents relating to the trials of Blasco Garay in the archives at Simancas, but has found no reference whatever to steam as the power employed in causing the paddles to revolve.[20] The experiments were made at Malaga and Barcelona respectively, in the years 1540 and 1543: in one the vessel was propelled by a paddle-wheel on each side worked by twenty-five men, and in the other by a paddle-wheel worked by forty men.
It appears probable that although others before Papin had speculated as to the possibility of constructing a boat to be driven by the power of steam, he was the first to test the theory by actual experiment; the first to construct a model steamboat. His first experiments were doubtless failures. The engine contrived by himself was found inapplicable to the driving of ships, as it had been to the pumping of mines; and it was not until he saw the model of Savery’s engine exhibited to the Royal Society of London, in 1698, and witnessed the trial of the same inventor s paddle-wheel boat on the Thames in the course of the same year that it occurred to him to combine the two contrivances in one, and apply Savery’s engine to drive Savery’s paddle-wheels. Returning to Marburg, he proceeded with his experiments, and informed Liebnitz that he had employed both suction and pressure by steam; that he had made a model of a carriage propelled by this force, which succeeded; and he hoped that the same power would answer for boats. Papin prosecuted his idea with great zeal, trying many expedients, encountering many difficulties, and meeting with many disappointments. At length, after about fifteen years’ labour, he succeeded in constructing a model engine, fitted in a boat—“une petite machine d’un vaisseau à roues”—which worked to his satisfaction. His next object was to get his model transported to London, to exhibit it on the Thames. “It is important,” he writes to Liebnitz (7th July, 1707), “that my new construction of vessel should be put to the proof in a seaport like London, where there is depth enough to apply the new invention, which, by means of fire, will render one or two men capable of producing more effect than some hundreds of rowers.” Papin had considerable difficulty in obtaining the requisite permission from the authorities to enable his model to pass from the Fulda to the Weser; but at length he succeeded, and the little vessel reached Münden, when, to Papin’s great grief, it was seized by the boatmen of the river, and barbarously destroyed.
The year after this calamity befell Papin’s machine he wrote an urgent letter to his old friends of the Royal Society at London, asking them to advance him sufficient money to construct another engine “and to fit it so that it might be applied for the rowing of ships.” The Society, however, did not see their way to assisting Papin in the manner proposed, most likely because of the expense as well as uncertainty of the experiment. Two years later, worn out by work and anxiety, the illustrious exile died; and it was left for other labourers to realise the great ideas he had formed as to locomotion by steam-power.
The apparently resultless labours of these men will serve to show what a long, anxious, and toilsome process the invention of the steam-engine has been. The early inventors had not the gratification of seeing their toils rewarded by even the faintest glimmering of practical success. One after another, they took up the subject, spent days and nights of study over it, and, laying down their lives, there left it. To many the study brought nothing but anxiety, toil, distress, and sometimes ruin; while some fairly broke their hearts over it. But it was never abandoned. Disregarding the fate of their predecessors, one labourer after another resumed the investigation, advancing it by further stages, until at length the practicable working steam-engine was invented, presenting, perhaps, the most remarkable illustration of the power of human skill and perseverance to be found in the whole history of civilisation.
CHAPTER III.
Captain Savery—His Fire-engine.
The attempts hitherto made to invent a working steam-engine, it will be observed, had not been attended with much success. The most that could be said of them was, that, by demonstrating the impracticable, they were gradually leading other experimenters in the direction of the practicable. Although the progress made seemed but slow, the amount of net result was by no means inconsiderable. Men were becoming better acquainted with the elastic force of steam. The vacuum produced by its condensation in a closed vessel, and the consequent atmospheric pressure, had been illustrated by repeated experiments; and many separate and minor inventions, which afterwards proved of great value, had been made, such as the four-way cock, the safety-valve, and the piston moving in a cylinder. The principle of a true steam-engine had not only been demonstrated, but most of the separate parts of such an engine had been contrived by various inventors. It seemed as if all that was now wanting was a genius of more than ordinary power to combine them in a complete and effective whole.