Fire-Cocks, are contrivances for admitting water into pipes or reservoirs : churchwardens in London, and within the bills of mortality, are enjoined to fix them at proper distances in streets, together with painted characters on the opposite wall, pointing out such distance. They are also ordered to deposit in every house thus marked, an instrument or key for opening a plug, and likewise a large engine, and an hand-engine, under the penalty of 101.