construction of a vessel Ritchie United States Navy Standard Compass and Azimuth Circle for Determining the Magnetic Declination (Variation of the Compass). Horizontal Force Instrument Devised by the Department of Terrestrial Magnetism. Dip Circle and Total Force Instrument Mounted on Gimbal Stand for Use on Board Ship Showing Manner of Mounting and Details of the Instrument. July 1907. Ship Horizontal Force Instrument Mounted on Tripod for Shore Observations at the Honolulu Magnetic Observatory September 1907., scientific american, 1908-02-15
construction of a vessel Ritchie United States Navy Standard Compass and Azimuth Circle for Determining the Magnetic Declination (Variation of the Compass). Horizontal Force Instrument Devised by the Department of Terrestrial Magnetism. Dip Circle and Total Force Instrument Mounted on Gimbal Stand for Use on Board Ship Showing Manner of Mounting and Details of the Instrument. July 1907. Ship Horizontal Force Instrument Mounted on Tripod for Shore Observations at the Honolulu Magnetic Observatory September 1907., scientific american, 1908-02-15
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