For some time Thomas Newcomen carried on his experiments in secret on the leads of his house. A letter extant of the time is quoted by Mr. Lidstone.
“When [Newcomen] was engaged on his great work, which took him three years from its commencement until it was completed, and was kept a profound secret, some of his friends would press Mrs. Newcomen to find out what her husband was engaged about, and, ‘for their part, they would not be satisfied to be kept in ignorance.’ Mrs. Newcomen replied, ‘I am perfectly easy. Mr. Newcomen cannot be employed about anything wrong; and I am fully persuaded, when he thinks proper, he will, himself, unasked, inform me.’”
When Thomas Newcomen had perfected his engine he associated with himself Calley or Cawley, a Dartmouth brazier, and How, another Dartmouth man, in applying for a patent.
Newcomen was a man of reading, and was in correspondence with Dr. Hooke, secretary of the Royal Society. There are to be found among Hooke’s papers, in the possession of the Royal Society, some notes of observations made by him for the use of Newcomen on Papin’s boasted method of transmitting to a great distance the action of a mill by means of pipes. Papin’s project was to employ the mill to work two air pumps of great diameter. The cylinders of these pumps were to communicate by means of pipes with equal cylinders furnished with pistons in the neighbourhood of a mine. The pistons were to be connected by means of levers with the piston-rods of the mine. Therefore, when the piston of the air pumps at the mill was drawn up by the engine the corresponding piston at the side of the mine would be pressed down by the atmosphere, and thus would raise the piston-rod in the mine and throw up the water. It would appear from these notes that Dr. Hooke dissuaded Newcomen from erecting a machine on this principle, of which he saw the fallacy.
It is highly probable that, in the course of his labours and speculations, it occurred to Newcomen that the vacuum he so much desired to create might be produced by steam, and that this gave rise to his new principle, and the construction of his steam engine. He saw the defects of Savery’s engine, and laboured to correct them. Savery, however, claimed the invention as his own, which lay at the root of Newcomen’s improvements; and Newcomen, being a Quaker, and averse from contention, and moreover glad to be assisted by Savery’s wide circle of acquaintances, was content to share the honours and the profits with Savery.
Switzer, who knew both, says: “Mr. Newcomen was as early in his invention as Mr. Savery was in his; only, the latter being nearer the Court, had obtained the patent before the other knew it, on which account Mr. Newcomen was glad to come in as a partner to it.”[26]
The STEAM ENGINE near Dudley Castle.
Invented by Capt. Savery. & Mr. Newcomen
Erected by ye later. 1712
delin. & Sculp by Tt Barney 1719.
Reproduced by kind permission of Messrs. Macmillan & Co.