At Portsmouth the tide flows about seven hours and ebbs about five; and the velocity with which the ebb tide runs out effectually scours the channel at the mouth of the harbour, and prevents the accumulation of sand. It is high water in the harbour at half-past 11 o'clock at the full and change of the moon; and the rise of spring tides is about eighteen feet, and of neaps about twelve. In the months of March and April the specific gravity of the water in Portsmouth harbour becomes so much increased, that ships lying there are observed to float about two inches lighter than at other times of the year. The latitude of the Observatory in the Dock-yard is 50° 48' 3" north; longitude 1° 5' 59" west. Though Portsmouth does not appear to have been a place of much consideration as a naval station previous to the reign of Henry VIII., who may be regarded as the first English King that established a permanent royal navy, it was yet undoubtedly a town of some consequence long before that time. In 1194, Richard I. granted a charter to the inhabitants, wherein, after declaring that he retains the town of "Portsmue" in his own hands, he establishes an annual fair to be held therein for fifteen days, to which all persons of England, Normandy, Poictou, Wales, Scotland, and all others, either foreigners or his own people, might freely resort, and enjoy the same privileges as at the fairs of Winchester, Hoiland, or elsewhere in his dominions. The burgesses of "Portsmue," as the place was then called, were also allowed to have a weekly market, with the same privileges and immunities as those of Winchester and Oxford; with freedom from all tolls of portage, passage, and stallage, and exemption from suit and service at hundred and county courts.[9] This charter was confirmed in 1201 by King John, and in 1230 by Henry II.; and in 1256 the latter monarch granted another charter, establishing a guild of merchants at Portsmouth. The privileges of the burgesses were at several different times confirmed by succeeding kings; and, in 1627, Charles I. granted them a charter, whereby a mayor and twelve aldermen were appointed for the civil government of the town. This charter, which was renewed by Charles II., has since been modified by the Municipal Reform Bill of 1835, which directs that the borough shall be divided into six wards, which shall elect a town council of forty-two members. In 1298 the borough was summoned to send two members to Parliament, a privilege which it continues to enjoy. [9] Anderson's History of Commerce, vol. i., p. 180., edit. 1787. [Illustration: RIGGING HULK AND FRIGATE, PORTSMOUTH.] PORTSMOUTH. RIGGING-HULK, WITH A NEW FRIGATE ALONGSIDE.