Boston whaler returning to ship from liberty party. Boston whaler off of PEIRCE.

Ferdinand Hassler' s carriage on road at base of cliff. Sketch by John Farley - mid 1830's.

Ferdinand Hassler directing the movement of the great theodolite to the station. Working on Fire Island, about 1837. Sketch by John Farley.

Reconnaissance in Coast Ranges of California

Breaking camp at Uncompaghre Peak on the 39th Parallel transcontinental arc. Party of William Eimbeck on mountain triangulation.

Roland D. Horne on pony

Station Stephens East Base Minnesota - marking complete. 98th Meridian - Beginning of the first great north-south arc.

Building party leaving Lampasas, Texas. J.S. Bilby in light buggy.

Jasper Bilby at Station Foss 1904 Minnesota. Wagon used by him to carry instruments and other light outfit.

Transportation outfit - party of E.R. Martin. International Boundary Commission. Continental Divide to Lake of Woods

Transportation outfit - party of E.R. Martin. International Boundary Commission. Continental Divide to Lake of Woods

A bad mudhole on the way to Kluane. 141st Meridian Survey.

Horses and man covered for mosquitoes. 141st Meridian Survey.

Two views of Hassler' s carriage. John Farley sketch.

Packing them up in the morning - Montana. Triangulation party camp.

Dog sled trip up the 141st Meridian to the Arctic Ocean. International Boundary Party under Assistant John H. Turner. Traveled from Porcupine to Arctic Ocean and back in 18 days. A round trip of over 400 miles --- lowest temperature was -50 Fahrenheit. March 27 to April 14, 1890

Pack train. Triangulation party on the move.

On way to Station Stump. Too much mud.

On way to Station Stump. Down and out - too much mud.

On way to Station Stump. Too much soft snow.

On way to Station Stump

Climbing peak 5300 with survey gear - 141st meridian. Alaska - Canada Boundary Survey.

Jumping a crevass at Bradford Glacier, Alaska

The trail up Quiniluban. Survey crew off Ship FATHOMER.

Using Yukon sled across Portage Glacier. Survey crew of R. P. Strough.

Packing instruments for astro work. Nearly 300 pounds total. Astro crew of C.V. Hodgson.

Taylor carrying 70 pounds. Astro crew of C.V. Hodgson.

Packing up Lookout Mountain - Mt. Hood in background. Astro crew of C.V. Hodgson.

Building party coming down from Station Remmel. Triangulation party of E. O. Heaton.

I hate these narrow ridges. Survey crew from ship WESTDAHL.

I hate these narrow ridges. Survey crew from ship WESTDAHL.

On the way to Station Stump after the horses gave out. Triangulation party of William M. Scaife.

Getting there the hard way - I. Triangulation party of William M. Scaife.

Getting there the hard way - II. Triangulation party of William M. Scaife.

Getting there the hard way - III - climbing Station Wolverine. Triangulation party of William M. Scaife.

Getting there the hard way - IV. Fueled by willpower. Triangulation party of William M. Scaife.

Getting there the hard way - V. Triangulation party of William M. Scaife.

All tuckered out. Triangulation party of William M. Scaife. Chief of Party William M. Scaife

Ready to rope up prior to crossing Twin Glacier. William Scaife with rope. Triangulation party of William M. Scaife

Crossing Twin Glacier. Triangulation party of William M. Scaife.

End of trip across Twin Glacier. Triangulation party of William M. Scaife.

Level party of B. E. Tilton.

Early mechanized level party with hand-velocipede. Observer riding ahead. Level party of W.H. Burger.

Early level crew - taking the back sight. Umbrella shading instrument, recorder writing down observations and computing. Level party of W.H. Burger.

Early level crew - passing the mallet. Rear rodman passing front rodman, recorder pulling. Rodman moving ahead will drive spike to steady rod.

Living in a railroad box-car left on the siding. Ford Kurtz - member of early level crew.

William Scaife on motor velocipede south of Fairbanks. Triangulation party of William M. Scaife.

Leveling crew moving velocipede off tracks for approaching train. Level party of Herman Odessey.

Leveling crew entering tunnel on velocipede. Hope they knew the train schedule. Level party of Herman Odessey.

Leveling crew with inclined tripod mounted on velocipede. Level party of J.D. Crichton.