Three years later he exhibited his third machine to the Royal Society, and on the 30th of November, 1749, he was awarded the Gold Medal for the year. In presenting it, Mr. Folkes, the President, said to Mr. Harrison, "I do here, by the authority and in the name of the Royal Society of London for the improving of natural knowledge, present you with this small but faithful token of their regard and esteem. I do, in their name congratulate you upon the successes you have already had, and I most sincerely wish that all your future trials may in every way prove answerable to these beginnings, and that the full accomplishment of your great undertaking may at last be crowned with all the reputation and advantage to yourself that your warmest wishes may suggest, and to which so many years so laudably and so diligently spent in the improvement of those talents which God Almighty has bestowed upon you, will so justly entitle your constant and unwearied perseverance."
Mr. Folkes, in his speech, spoke of Mr. Harrison as "one of the most modest persons he had ever known. In speaking," he continued, "of his own performances, he has assured me that, from the immense number of diligent and accurate experiments he has made, and from the severe tests to which he has in many ways put his instrument, he expects he shall be able with sufficient certainty, through all the greatest variety of seasons and the most irregular motions of the sea, to keep time constantly, without the variation of so much as three seconds in a week,—a degree of exactness that is astonishing and even stupendous, considering the immense number of difficulties, and those of very different sorts, which the author of these inventions must have had to encounter and struggle withal."
Although it is common enough now to make first-rate chronometers—sufficient to determine the longitude with almost perfect accuracy in every clime of the world—it was very different at that time, when Harrison was occupied with his laborious experiments. Although he considered his third machine to be the ne plus ultra of scientific mechanism, he nevertheless proceeded to construct a fourth timepiece, in the form of a pocket watch about five inches in diameter. He found the principles which he had adopted in his larger machines applied equally well in the smaller, and the performances of the last surpassed his utmost expectations. But in the meantime, as his third timekeeper was, in his opinion, sufficient to supply the requirements of the Board of Longitude as respected the highest reward offered, he applied to the Commissioners for leave to try that instrument on board a royal ship to some port in the West Indies, as directed by the statute of Queen Anne.
Though Harrison's third timekeeper was finished about the year 1758, it was not until March 12, 1761, that he received orders for his son William to proceed to Portsmouth, and go on board the Dorsetshire man-of-war, to proceed to Jamaica. But another tedious delay occurred. The ship was ordered elsewhere, and William Harrison, after remaining five months at Portsmouth, returned to London. By this time, John Harrison had finished his fourth timepiece—the small one, in the form of a watch. At length William Harrison set sail with this timekeeper from Portsmouth for Jamaica, on November 18th, 1761, in the Deptford man-of-war. The Deptford had forty-three ships in convoy, and arrived at Jamaica on the 19th of January, 1762, three days before the Beaver, another of His Majesty's ships-of-war, which had sailed from Portsmouth ten days before the Deptford, but had lost her reckoning and been deceived in her longitude, having trusted entirely to the log. Harrison's timepiece had corrected the log of the Deptford to the extent of three degrees of longitude, whilst several of the ships in the fleet lost as much as five degrees! This shows the haphazard way in which navigation was conducted previous to the invention of the marine chronometer.
When the Deptford arrived at Port Royal, Jamaica, the timekeeper was found to be only five and one tenth seconds in error; and during the voyage of four months, on its return to Portsmouth on March 26th, 1762, it was found (after allowing for the rate of gain or loss) to have erred only one minute fifty-four and a half seconds. In the latitude of Portsmouth this only amounted to eighteen geographical miles, whereas the Act had awarded that the prize should be given where the longitude was determined within the distance of thirty geographical miles. One would have thought that Harrison was now clearly entitled to his reward of 20,000L.
Not at all! The delays interposed by Government are long and tedious, and sometimes insufferable. Harrison had accomplished more than was needful to obtain the highest reward which the Board of Longitude had publicly offered. But they would not certify that he had won the prize. On the contrary, they started numerous objections, and continued for years to subject him to vexatious delays and disappointments. They pleaded that the previous determination of the longitude of Jamaica by astronomical observation was unsatisfactory; that there was no proof of the chronometer having maintained a uniform rate during the voyage; and on the 17th of August, 1762, they passed a resolution, stating that they "were of opinion that the experiments made of the watch had not been sufficient to determine the longitude at sea."
It was accordingly necessary for Harrison to petition Parliament on the subject. Three reigns had come and gone since the Act of Parliament offering the reward had been passed. Anne had died; George I. and George II. had reigned and died; and now, in the reign of George III.—thirty-five years after Harrison had begun his labours, and after he had constructed four several marine chronometers, each of which was entitled to win the full prize,—an Act of Parliament was passed enabling the inventor to obtain the sum of 5000L. as part of the reward. But the Commissioners still hesitated. They differed about the tempering of the springs. They must have another trial of the timekeeper, or anything with which to put off a settlement of the claim. Harrison was ready for any further number of trials; and in the meantime the Commissioners merely paid him a further sum on account.
Two more dreary years passed. Nothing was done in 1763 except a quantity of interminable talk at the Board of Commissioners. At length, on the 28th of March, 1764, Harrison's son again departed with the timekeeper on board the ship Tartar for Barbadoes. He returned in about four months, during which time the instrument enabled the longitude to be ascertained within ten miles, or one-third of the required geographical distance. Harrison memorialised the Commissioners again and again, in order that he might obtain the reward publicly offered by the Government.
At length the Commissioners could no longer conceal the truth. In September,1764, they virtually recognised Harrison's claim by paying him 1000L. on account; and, on the 9th of February,1765, they passed a resolution setting forth that they were "unanimously of opinion that the said timekeeper has kept its time with sufficient correctness, without losing its longitude in the voyage from Portsmouth to Barbadoes beyond the nearest limit required by the Act 12th of Queen Anne, but even considerably within the same." Yet they would not give Harrison the necessary certificate, though they were of opinion that he was entitled to be paid the full reward!
It is pleasant to contrast the generous conduct of the King of Sardinia with the procrastinating and illiberal spirit which Harrison met with in his own country. During the same year in which the above resolution was passed, the Sardinian minister ordered four of Harrison's timekeepers at the price of 1000L. each, at the special instance of the King of Sardinia "as an acknowledgement of Mr. Harrison's ingenuity, and as some recompense for the time spent by him for the general good of mankind." This grateful attention was all the more praiseworthy, as Sardinia could not in any way be regarded as a great maritime power.