Mormon History, May 11, 1847

Appleton Milo Harmon constructs the Mormon pioneer "Roadometer" (odometer) according to Orson Pratt-s design and William Clayton's original suggestion. The next day it is attached to Clayton's wagon and relieves Clayton of the task of counting individual rotations of a wagon wheel which he has been doing until now.

[source: On This Day in Mormon History, http://onthisdayinmormonhistory.blogspot.com]
[On This Day in Mormon History, http://onthisdayinmormonhistory.blogspot.com]

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