Eureka (word) "Eureka! Eureka!" after he had stepped into a bath and noticed that the water level rose, whereupon he suddenly understood that the volume of water displaced must be equal to the volume of the part of his body he had submerged. (This relation is "not" what is known as Archimedes' principle—that deals with the "upthrust" experienced by a body immersed in a fluid.) He then realized that the volume of irregular objects could be measured with precision, a previously intractable problem. He is said to have been so eager to share his discovery that he leapt out of his bathtub
Eureka, California become northern California repeatedly missed definitively locating Humboldt Bay because of a combination of geographic features and weather conditions which concealed the narrow bay entrance from view. Despite a well-documented 1806 sighting by Russian explorers, the bay was not definitively known by Europeans until an 1849 overland exploration provided a reliable accounting of the exact location of what is the second largest bay in California. The timing of this discovery led to the May 13, 1850, founding of the settlement of Eureka on its shore by the Union and Mendocino Exploring (development) companies. After the primary California Gold Rush in