Quarantine Edinburgh and Leith, grain was from that date declared to be a non-susceptible article. About 1788 an order of the council required every ship liable to quarantine, in case of meeting any vessel at sea, or within four leagues of the coast of Great Britain or Ireland, to hoist a yellow flag in the daytime and show a light at the main topmast head at night, under a penalty of After 1800, ships from plague-countries (or with foul bills) were enabled to perform their quarantine on arrival in the Medway instead of taking a Mediterranean port on the way for
Flag of Sweden used from a flagpole extending from a building, the flag is recommended to have a width equaling a third of the height (length) of the pole. It is further recommended to fly the flag only during daytime, and to lower it no later than 9 pm. Only when the country is at war is it recommended to fly the flag also at night. The king and queen use a royal flag with the greater national coat of arms. Other members of the royal house use a royal flag with the lesser national coat of arms. On naval ships the flag