"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."
12 May 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."
16 May 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's Journal, , 143,152).