Location:
Confluence Point
(North and South Forks of Platte combine)
Distance: 563 miles from Nauvoo

It was in Brigham Young's Vanguard Company on May 11, 1847, at a location 3/4 of a mile north of the confluence of the North and South Platte Rivers, that the roadometer was attached to a wagon owned by Heber C. Kimball and driven by Philo Johnson. After being attached and used first on the morning of May 12, 1847, it continued in use the rest of their journey to Salt Lake Valley. The 1847 pioneers did not "invent" the roadometer, but the version they created was accurate enough for William Clayton to later use the recorded mileage in his famous Latter-Day Saints' Emigrants' Guide.

William Clayton

May 11, 1847

"Brother Appleton Harmon is working at the machinery for the wagon to tell the distance we travel and expects to have it in operation tomorrow, which will save me the trouble of counting, as I have done, during the last four days."

May 12, 1847

"Morning cool, weather fine. Brother Appleton Harmon has completed the machinery on the wagon so far that I shall only have to count the number of miles, instead of the revolution of the wagon wheel."

May 16, 1847

"About noon today Brother Appleton Harmon completed the machinery on the wagon called a 'roadometer' by adding a wheel to revolve once in ten miles, showing each mile and also each quarter mile we travel, and then casing the whole over so as to secure it from the weather."

(William Clayton Dairy, 1847, microfilm of holograph, LDS Church Archives.)

Appleton Milo Harmon

Summer 1847

"Arose in the morning as usual at the blast of the winding horn. got up our teams & started on our way and crossed the Looking glass crick about one mile from whare we ware camped and travled about 3 miles when we seen a lone indian approaching toward us from [a] narrow skirt of timber . . . soon after several more Indians immerged from the same wood & on coming up to us seemed to extend the hand of fellowship & say how de do."

(Appleton Milo Harmon, Journal, 1847, HDC.)

Wilford Woodruff

May 8, 1847

"All the sights of Buffalo that our eyes beheld was enough to astonish man. . . . The face of the earth was alive and moving like the waves of the sea."

(Wilford Woodruff Journals, 8 May, 1847, HDC.)

Journal photographs courtesy of Infobases, Inc. [an error occurred while processing this directive]