Closeup of the small brass bolt with + in witness post North. See: http://www.penryfamily.com/surveying/meadesranch.html

Meades Ranch 1891 bronze disk triangulation marker. See: http://www.penryfamily.com/surveying/meadesranch.html

Witness post South located south of Meades Ranch 1891. See: http://www.penryfamily.com/surveying/meadesranch.html

Closeup of the small brass bolt with + in witness post South. See: http://www.penryfamily.com/surveying/meadesranch.html

Meades Ranch Reference Mark No. 1, set in 1948. Located east of the triangulation station. See: http://www.penryfamily.com/surveying/meadesranch.html

Meades Ranch Reference Mark No. 1, set in 1948. Located east of the triangulation station. See: http://www.penryfamily.com/surveying/meadesranch.html

Meades Ranch Reference Mark No. 2, set in 1948. Located west of the triangulation station. See: http://www.penryfamily.com/surveying/meadesranch.html

Meades Ranch Reference Mark No. 2, set in 1948. Located west of the triangulation station. See: http://www.penryfamily.com/surveying/meadesranch.html

View looking due north from triangulation station Meades Ranch. See: http://www.penryfamily.com/surveying/meadesranch.html

View looking due east from the triangulation station. Limestone posts are visible from north-south fence .

View looking due south from the triangulation station. See: http://www.penryfamily.com/surveying/meadesranch.html

View looking due west from the triangulation station. See: http://www.penryfamily.com/surveying/meadesranch.html

The triangulation station Meades Ranch, left of marker post, and Reference Mark No. 1 in the foreground. Looking to the northwest. See: http://www.penryfamily.com/surveying/meadesranch.html

Meades Ranch Reference Mark No. 3, set in 1967. See: http://www.penryfamily.com/surveying/meadesranch.html

Meades Ranch Reference Mark No. 3, set in 1967. Next to limestone fence post on old north-south fence line. See: http://www.penryfamily.com/surveying/meadesranch.html

Tower built over Triangulation Station Kipnuk

Clarence E. "Pete" Pedersen cartoon of Nansen cast operations on the USC&GS EXPLORER

Clarence E. "Pete" Pedersen cartoon of biological trawling operations on the USC&GS EXPLORER

Clarence E. "Pete" Pedersen cartoon of drift bottle operations on the USC&GS EXPLORER

Clarence E. "Pete" Pedersen cartoon of current meter operations on the USC&GS EXPLORER

Clarence E. "Pete" Pedersen cartoon of geological divin investigations on the USC&GS EXPLORER

Clarence E. "Pete" Pedersen cartoon of fauna collecting operations on the USC&GS EXPLORER

Clarence E. "Pete" Pedersen cartoon of flora collecting operations on the USC&GS EXPLORER

Clarence E. "Pete" Pedersen cartoon of geological diving operations on the USC&GS EXPLORER

Clarence E. "Pete" Pedersen cartoon of underwater photography operations on the USC&GS EXPLORER

Clarence E. "Pete" Pedersen cartoon of weather balloon operations on the USC&GS EXPLORER

Clarence E. "Pete" Pedersen cartoon of sediment coring operations on the USC&GS EXPLORER

Plan and elevation of the tide gauge at H.M. Dockyard Sheerness and at Portsmouth.

General view of the leveling Instrument used at Sheerness showing also the front view and back view of the leveling staff (level rod in today's terminology .

"Plan of the Line of Levellings, from Sheerness to London."

Box tide gauge devised for the use of the Coast Survey by Lieutenant S. D. Trenchard, Asst. U.S. Coast Survey, U.S.N.

Tide gauge, date unknown.

Curves of observation of the tides at Rincon Point, San Diego, and Astoria.

Tides at Rincon Point San Francisco January and February 1853

"Approximate Cotidal Lines of the Pacific Coast of the United States from investigations in the Coast Survey"

"Approximate Cotidal Lines of the Atlantic Coast of the United States from investigations in the Coast Survey"

Lieutenant Hubert Keith looking over side during Atomic Energy Commission Project testing integrity of drums for possible storage of nuclear waste.

Rolling drum over side during Atomic Energy Commission project testing integrity of drums for possible storage of nuclear waste. Divers on bottom were filming the descent of the drums and their impact on the bottom.

Preparation for sailing on Atomic Energy Commission project testing the integrity of drums for possible storage of nuclear waste.

Roberts Radio Current Meter buoy being recovered.

A graph showing the rise of mean sea level in Baltimore. Perhaps this was one of the earliest harbingers of sea level rise although at the time there was uncertainty as to how to interpret this graph. Data was obtained through C&GS tide gage observations.

Elevation bench mark used for tidal leveling operations.

A "basic bench mark" set in the top of a stone pillar outside the U. S. C.& G.S. headquarters.

A "basic bench mark" set in the top of a stone pillar

Tide gage workings

Repairing a box tide gage

Repairing a box tide gage

Buoy anchored off Cape Hatteras in 1700 fathoms of water with 2800 fathoms total chain. The Gulf Stream is running 4 to 4 1/2 knots pulling the buoy nearly under. The buoy is actually comprised of two spherical sections, one over the other although both are out of sight with only the top showing.

Buoy anchored off Cape Hatteras in 1700 fathoms of water with 2800 fathoms total chain. The Gulf Stream is running 4 to 4 1/2 knots pulling the buoy nearly under. The buoy is actually comprised of two spherical sections, one nearly under. The buoy is actually comprised of two spherical sections, one

Current float with drogue being readied for deployment.