Up to this time all 80-gun ships were three-deckers, but after 1759 no more were built. The building also of 70 and 60 gun ships was discontinued about the same period. The finest ships were those taken from the French and added to the Royal Navy. The first English 80-gun ship on two decks was the _Caesar_, launched in 1793. The Marine Society at the peace came to the resolution of receiving and making provision for all boys under sixteen years of age who had been, or might be, discharged from his majesty's service, by putting them out apprentices in the merchant-service. 295 boys made application for employment, and were provided for. A body of sailors presented a petition to the king requesting to have the D's, placed against their names for deserter, taken off. His majesty granted the request to all who had again entered on board a king's ship. It appears that the whole number of seamen and marines employed during the war amounted to 184,893. Of these, only 1512 had been killed in action or by accident, while 133,700 had either died by sickness or were missing--probably, had deserted. Thus, on the books of the Navy Office but 49,673 remained. Of these, all except 16,000 were paid off at the peace. To pay them, Parliament granted 832,000 pounds; to pay the officers, including those on half-pay, 398,000 pounds. In 1764 Mr Harrison's chronometer was again tried on board the _Tartar_ frigate, commanded by Captain John Lindsay, who reported most favourably on it. This year the officers of his majesty's navy were directed to act as custom-house officers on the coast of America, as well as in the British Channel, but, from the complaints made, the Admiralty released them from a service which they considered as degrading to their situation. On the 3rd of July his majesty's ship _Dolphin_, of 20 guns, commanded by the Honourable John Byron, and the _Tamer_ sloop of war, 14 guns, Captain Mouat, sailed from Plymouth on a voyage of discovery. On her return in 1766 the _Dolphin_ was again despatched, under the command of Captain Samuel Wallis, and the _Swallow_ sloop of war, Captain Carteret, was ordered to accompany her till she should have got through the Straits of Magellan. In 1768 a pump, invented by Mr Coles in 1764, was tried on board the _Seaford_ frigate in Portsmouth harbour, and it was found that with four men it pumped out a ton of water in 43 and a half seconds; with two men, in 55 seconds; and when choked with shingle ballast, it was cleared in 4 minutes: while the old pump, with seven men, pumped out one ton of water in 76 seconds.