The Galilee was a brigantine, built in 1891, designed by Matthew Turner. She started on the packet line between San Francisco and Tahiti and was reckoned a very fast ship. In 1905 she was chartered by the Carnegie Institution's Department of Terrestrial Magnetism and converted into a magnetic observatory. She was used to make observations of Earth's magnetic field on three cruises over a period of three years from 1905 to 1908 in the Pacific Ocean.