History of the Metropolitan Police Service by the end of the 19th century. During the 1860s, the flintlock pistols that had been purchased in 1829 were decommissioned from service, being superseded by 622 Beaumont–Adams revolvers firing the .450 cartridge which were loaned from the army stores at the Tower of London following the Clerkenwell bombing. In 1883, a ballot was carried out to gather information on officers' views on whether they wished to be armed, and 4,430 out of 6,325 officers serving on outer divisions requested to be issued with revolvers. The now obsolete Adams revolver was returned to stores for emergencies, and the Bulldog 'Metropolitan
Metropolitan Police Service easily be identified from one or more blue lamps located outside the entrance, which were introduced in 1861. The oldest Metropolitan police station, which opened in Bow Street in 1881, closed in 1992 and the adjoining Bow Street Magistrates' Court heard its last case on 14 July 2006. The oldest operational police station in London is in Wapping, which opened in 1908. It is the headquarters of the marine policing unit (formerly known as Thames Division), which is responsible for policing the River Thames. It also houses a mortuary and the River Police Museum. Paddington Green Police Station, which is