Bailiwick of Guernsey him Sark in perpetuity, on condition that he kept the island free of pirates and that the island was occupied by at least forty men to defend it. Despite most families coming from Jersey, Sark remained within the Bailiwick of Guernsey. There is no flag or coat of arms for the Bailiwick of Guernsey. In historic times, the governor would have used his personal symbols before a generic flag for use by the governor was created. In 1279 Edward I granted a Seal for use in the Channel Islands. In 1304 separate seals were provided to Jersey and Guernsey. The
History of water supply and sanitation was invented by Alexander Cummings in 1775 but became known as the U-bend following the introduction of the U-shaped trap by Thomas Crapper in 1880. The first screw-down water tap was patented in 1845 by Guest and Chrimes, a brass foundry in Rotherham. Founders of microscopy, Antonie van Leeuwenhoek and Robert Hooke, used the newly invented microscope to observe for the first time small material particles that were suspended in the water, laying the groundwork for the future understanding of waterborne pathogens and waterborne diseases. Sir Francis Bacon attempted to desalinate sea water by passing the flow through a sand