Underground magnetic observatory built at the University of Wisconsin in 1870's. Built under direction of Coast Survey. Observations made to Coast Survey specifications. One of many academic geophysical observatories built under guidance of C&GS

Magnetic observations along the Yukon River.

Coast Guard Cutter Bear at Demarcation Point. Provided transportation for magnetic field work by C&GS officer J. T. Watkins

Magnetic observations at sea on the C&GS Ship BACHE.

Early use of proton precession marine magnetometer. Deployment of towed magnetometer on C&GS Ship PIONEER

Brown pendulum apparatus gravity meter. Named for its inventor, Lt. E. J. Brown, C&GS. Lt. Brown died in an automobile accident in 1935.

Mendenhall half-second pendulums. Figure 2 of William Bowie's "Investigations of Gravity and Isostasy"

Gravity observing apparatus. Figure 3 of William Bowie's "Investigations of Gravity and Isostasy"

Original form of Mendenhall half-second pendulum gravity measuring apparatus. Figure 3 of William Bowie's "Investigations of Gravity and Isostasy"

Ground shaker at Position "B". Used to determine earthquake engineering characteristics of buildings. C&GS was the first organization to undertake engineering seismology studies. Party of William D. Patterson

Building shaker in the doorway of a building. Used to determine earthquake engineering characteristics of buildings. C&GS was the first organization to undertake engineering seismology studies. Party of William D. Patterson

Ground shaker at Position "A". Used to determine earthquake engineering characteristics of buildings. C&GS was the first organization to undertake engineering seismology studies. Party of William D. Patterson

Deployment of towed magnetometer on C&GS Ship PIONEER.

Bank of recording instruments at Honolulu geophysical observatory. Recording tidal levels at remote sites throughout Pacific Basin. Used for tsunami warning system.

Bank of recording instruments at Honolulu geophysical observatory. Recording tidal levels at remote sites throughout Pacific Basin. Used for tsunami warning system.

Radical changes in sea level following 1964 Alaska Good Friday Earthquake.

Earthquake damage in Alaska following 1964 Good Friday Earthquake

Tsunami damage at Kodiak following 1964 Good Friday Earthquake

Tsunami damage at Seward following 1964 Good Friday Earthquake

Tsunami damage at Kodiak following 1964 Good Friday Earthquake

Tsunami damage at Seward following 1964 Good Friday Earthquake

Reproduction of first map showing magnetic declination in the United States. First published by the Coast Survey in 1856

Proton vector magnetometer used to measure the absolute value of magnetic field

Proton vector magnetometer used to measure the absolute value of magnetic field

Using a magnetometer to measure the declination. Declination is the angle between true north and magnetic north

Description not available.

A happy face cactus in the Galapagos Islands. During western hemisphere magnetic project

I think I'll take this thing for a spin. NOAA diver gets ready for a spin on a tourist moped . At the end of the cruise ship piers in Nassau

Disney eagle originally designed for the Coast and Geodetic Survey

The joy of kissing the baby. Equator crossing on NOAA Ship MOUNT MITCHELL

It is now official. Pizza can be delivered virtually anywhere

King Neptune dubbing a pollywog an official shellback. The end of the Equator crossing ordeal on a NOAA Ship

Hey Mike, let's try fishing somewhere else. They don't seem to be biting here. Fishermen followed bad advice about where the fish were biting. Building crew off PEIRCE on Eleuthera Island

Mac Smith - dressed to kill. What hydrographers wear for a night out on the town

Ronnie and Elvis greet geodetic party at Montana dude ranch

A Pinckney Island Industry. Moonshine in the Southeast

The crew of the SURVEYOR playing baseball at Dutch Harbor

Tidal benchmarks under 10 feet of ice. Ensign Sainsbury looks in vain for the 1911 benchmarks

Baseball at Dutch Harbor - the national pastime goes to the Aleutians

The rim of the crater of Mt. Erebus. The view from a helicopter

Lieutenant Cynthia McFee checking the distances to major cities. Mileage indicator at the South Pole. Lieutenant McFee was the third woman to winter over at the South Pole

Photographer takes self-portrait in South Pole marker. Atmosheric phenomena provide halo for observer

C&GS ship offshore near Rockland, Maine. Conducting observations along the Eastern Oblique Arc

A small grouper looks glumly at divers installing tide gauge

Survey launch with Shoran antenna departing PIONEER

Shoran antenna dismantled prior to launch pickup. Launch off of EXPLORER

Arctic Field Party hydrographic launch - a converted LCVP

Arctic Field Party hydrographic launch - a converted LCVP

Lake Survey hydrographic launch

SURVEYOR launches for detached party tied up