Keywords: 1889 Gymnote Gyroscope.jpg en In 1889 Arthur Krebs added an electric motor of his own to the Dumoulin builder of the Foucault gyroscope marine gyroscope in order to give a gyrocompass to the french experimental submarine Gymnote Giving the Gymnote submarine the ability to keep a streight line under water during several hours it allowed her to http //rbmn free fr/Gymnote_Blocus_1890 jpg force a naval block in 1890 Krebs family archives Philippe Krebs 2010-11 Gyroscopes Gymnote submarine 1888 Arthur Constantin Krebs |