Components of an automated magnetic observatory

Components of an automated magnetic observatory

Components of an automated magnetic observatory

Magnetic instrumentation

Calibrating magnetic instruments

Calibrating magnetic instruments

Calibrating magnetic instruments

Buoy outfitted for measuring geomagnetic paramters.

Buoy outfitted for measuring geomagnetic paramters.

Buoy outfitted for measuring geomagnetic paramters.

Buoy outfitted for measuring geomagnetic paramters.

Buoy outfitted for measuring geomagnetic paramters.

Buoy outfitted for measuring geomagnetic paramters.

Applications of gravity data.

Operating a gravity meter.

Recording gravity observations.

Lacoste and Romberg Gravity Meter

Lacoste and Romberg Gravity Meter

Operating Lacoste-Romberg gravity meter shipboard

Operating Lacoste-Romberg gravity meter shipboard

Operating Lacoste-Romberg gravity meter shipboard

Operating Lacoste-Romberg gravity meter shipboard

Lacoste-Romberg underwater gravity meter

Bottom mounted gravity meter ready for deployment.

Deploying a bottom-mounted gravity meter.

Deploying a bottom-mounted gravity meter.

The internal electronics of a bottom-mounted gravity meter.

The internal electronics of a bottom-mounted gravity meter.

The internal electronics of a bottom-mounted gravity meter.

Cover of a 1965 Coast and Geodetic Survey brochure discussing the tsunami and the tsunami warning system which was first developed by the Coast and Geodetic Survey. The tsunami picture is from the artwork "The Great Wave" by Katsushika Hokusai (1760-1849).

Cover of a 1965 Coast and Geodetic Survey brochure discussing the tsunami and the tsunami warning system which was first developed by the Coast and Geodetic Survey. The tsunami picture is from the artwork "The Great Wave" by Katsushika Hokusai (1760-1849).

The geomagnetic observatory at Camp Colonna on the Canada/U.S. Boundary on the 141st Meridian.

Announcement of the opening of the San Juan Geophysical Observatory. This was a new observatory as the C&GS had operated an observatory in Puerto Rico since 1903.

Invitation to the opening of the Fredericksburg Geomagnetic Observatory and Laboratory on May 23, 1956

Map showing locations of magnetic observatories now operated by the USGS that have co-located cooperative facilities with NOAA.

Tide gage record at Hilo, Hawaii, showing the 1946 tsunami.

Time diagram showing seismic sea wave (tsunami) travel time to Honolulu, Hawaii, from points around the Pacific basin.

Travel time curves of the seismic sea wave (tsunami) of April 1, 1946.

Seismological equipment formerly installed by the Coast and Geodetic Survey at the Sitka Geophysical Observatory.

Living quarters of the observer at the Coast and Geodetic Survey Sitka Geophysical Observatory.

Title page of computation book of ' Triangles for the Survey of the Coast' made in 1817 by F.R. Hassler.

Field sketch of triangulation stations- ' North-Eastern view from Buttermilk Hill.'

Field sketch of New York City as seen from Staten Island. ' North East view of the Horizon as seen from the fire Signal on Staten Island.'

View from triangulation station Fort Hale.

Westerly view from triangulation station Stony Hill. View includes conical tin signal on pole for seeing reflected sun at great distance.

Westerly view from triangulation station West Rock near New Haven.

Two telescopic views. Top view is of Osborne Hill as seen from Mt. Carmel. Bottom view is of Harrow Hill signal as seen from Buttermilk Hill.

Two telescopic views. Friar's Head Signal as seen from Mt. Carmel. Ruland Hill Signal as seen from Mt. Carmel.

Two telescopic views. Hempstead Harbor Signal as seen from Bald Hill. Loaf Hill Signal as seen from Bald Hill.

Ruland Hill Signal as seen from Mt. Carmel.