He had previously conveyed to the Lords of the Admiralty his statement of the rates at which his chronometer went, and the extent to which it was affected by change of temperature. On May 13th the vessel arrived at Barbadoes, and it was found that the amount of the daily deviations from mean time was only 43^s. in excess. He returned to England after an entire voyage of 156 days, and found that, allowing the gain of one second per day as stated by him in his sealed 'rate,' the whole gain was only 54^s. Harrison then was examined by a committee appointed for the purpose, and, having explained satisfactorily to them the principles of his instrument, he received another £5000. A trial was then made by another person with a chronometer made upon Harrison's plan, and this experiment also terminating favourably, the remaining parliamentary reward was paid over to Harrison, amounting in all to £20,000, a sum which was still further increased by gratuities from the Board of Longitude and the East India Company. Harrison's improvements in time-measuring were of considerable importance, as any one may readily conceive, but he was sufficiently candid to acknowledge that the balance, balance-spring, and compensation curb, as then used, were not simultaneously affected by changes of temperature, that small pieces were more readily affected than large ones, and pieces in motion sooner than pieces at rest, whence he concluded that if the provision for heat and cold could properly be arranged in the balance itself, as in his gridiron pendulum-clocks, the time might be better kept. Harrison's suggestion of a compensation balance in lieu of a compensating curb, incited Peter le Roy, a native of France, to the consideration of the question, and ultimately to the invention of a balance acted upon by mercury and alcohol. The compensation was effected by the balance itself, which, carrying the two thermometers, adjusted the mercury nearer or farther from the centre of the balance, according to the state of the atmosphere. About this period there was considerable emulation exhibited, both here and on the continent, upon the subject of time-measuring. Sully had aided largely in the advancement of the art of watch-making in London and Paris. Berthoud, Julien, and Pierre le Roy made many ingenious propositions, and amongst others the invention of the detached escapement is attributed to the last-named. In England we find the names of Arnold, Earnshaw, and Mudge associated about this date with the greatest improvements in chronometry, and as being those to whom prizes were at different times awarded by the Board of Longitude. In fact, few great inventions have since been made in the art, and our present high position as chronometer-makers is mainly due to the skill, energy, and perseverance then exhibited.