Partridge Island is located in the Bay of Fundy, about 1 km from the shoreline and the city of Saint John, New Brunswick. The island was set aside as a quarantine station in 1785 and operated as such between 1830 and 1941. Many immigrants arriving to Canada by ship, including thousands of Irish in 1847, were isolated on the island before being allowed to enter the country. This was done in an effort to prevent the spread of infectious diseases common on overcrowded vessels. In 1974, the Partridge Island quarantine station was designated a national historic site. Other important events are associated with the island, including the installation of the world’s first steam-operated fog alarm in 1859 (see also Robert Foulis).