Tower with observing tent to shield the instrument from the wind. Triangulation party of Wilbur Porter

Tower at Station Bowie.

Collimating the inner tower at Station Winnie. Collimation involved placing the observing instrument directly over the mark. Triangulation party of Carl I. Aslakson

Lightkeeper orienting lights for distant observers. Tower at Station Northome. Osborne at lights, Caouette recording, Tryon at tent. Triangulation party of Carl I. Aslakson

Tower at Station Eufaula.

Tower at Station Northome. Caouette on left, Osborn on right, Tryon observing. Triangulation party of Carl I. Aslakson

Tower at Station Winnie next to firetower. Triangulation party of Carl I. Aslakson

Photos # 5-7 show stages in completing a 50-foot tower at Station Tatum. Photo #8 shows theodolite being transported to top of tower. Triangulation party of Wilbur Porter. Photos # 5-8 of sequence

Station Weingard near Amarillo. Triangulation party of Wilbur Porter

Photos #1-4 show beginning of construction of 50-foot tower at Station Tatum. Triangulation party of Wilbur Porter. Photos 1-4 of sequence

Observing party on 103-foot tower in Missouri. Triangulation party of Carl I. Aslakson

Station Hunter - 159 feet - one of the bigger towers. Photo #2 of sequence. Triangulation party of Kenneth Crosby

A 159-foot tower. Note men on top and man climbing up

Building the tower at Station Hunter. Photo #1 of sequence. Triangulation party of Kenneth Crosby

Tower at Loma Prieta, Santa Cruz Mountains, covered with ice. Triangulation party of Lorne G. Taylor

Tower built with native timber.

Bilby tower built on oil rig south of New Orleans.

Tower at Station Whitsett destroyed by wind. Triangulation party of E. O. Heaton

A rough ride down. Drove his head right into the ground. Photo #1 of sequence

Ah, we're O.K. Just kidding! Photo #2 of sequence

A tower with a bad day. Anchor boards pulled out

Another tower with a bad day. Standing at the top (or what was the top)

A 90-foot tower wrecked by a storm. Triangulation party of E. O. Heaton

Looking through the twisted steel of a 90-foot tower wrecked by a storm. Triangulation party of E. O. Heaton

Tower blown down during September 1933 hurricane. Triangulation party of Roland D. Horne

Station Post on a good day. Triangulation party of Kenneth G. Crosby. Triangulation party of Kenneth G. Crosby

Station Post emulating the "Leaning Tower of Pisa". Leg settled badly in vicinity of ditch. Tower was rebuilt with one leg placed in center of road

Bilby tower failure at Station Flatlick due to tornado. Triangulation party of E. L. Jones

Bilby tower failure at Station Flatlick due to tornado. Triangulation party of E. L. Jones

Ferdinand Hassler's camp at the west end of the Great Fire Island Base Line.

George Davidson camp near the San Lorenzo River.

Breaking camp on Uncompahgre Peak - over 14,000 feet elevation. During the 39th Parallel Survey. Triangulation party of William Eimbeck

George Davidson observation cabin at San Luis Obispo, California. Believe that Davidson is seated on left

The "Medico" at the camp at Minnie Bay.

Another view of the camp at Minnie Bay.

Camp on trout stream near Tyonek.

Camp scene at Minnie Bay.

Cooking breakfast at a camp on the Olympic Peninsula. Believe the chef is Harry A. Seran. Triangulation party of Harry A. Seran

Camp on the Bulwark between Upper Cook Inlet and Prince William Sound. Triangulation party of R. P. Strough

Time for a haircut - Carey V. Hodgson reading paper and getting a trim. Astro party of Carey V. Hodgson

Camping in the shade in the desert. Earthquake studies in Southern California. Leveling and triangulation party of F. W. Hough

Government Land Office survey camp in South Dakota.

Campground at San Bernardino. Earthquake studies in Southern California. Leveling and triangulation party of F. W. Hough

The lightkeeper's camp at Station American. Earthquake studies in Southern California. Leveling and triangulation party of F. W. Hough

Camp at Station Beazer - things are getting cold.

Camp at Station Wall South Base with tent blown down by high wind. Astro party of E. J. Brown

Camp for level crew at 12,000-foot level on Mount Whitney. Level party of John H. Brittain

Camp on Necker Island in Mid-Pacific. Island was station for World Longitude Campaign. Astro party of E. J. Brown

Camp on eastern Lisianski Island. Island was station for World Longitude Campaign. Nesting place for albatross and other marine bird species. Astro party of E. J. Brown

A snaky-looking camp in Central Luzon. Campsite during triangulation of Central Luzon. Triangulation party of Elliott B. Roberts