Draft animals like horses, mules and cattle once provided pulling power for threshing machines
The Westinghouse two-horse tread power and No. 4 thresher from the 1886 Westinghouse Co. catalog: If bought as a set, this combination sold for $525. An elevator for bagging and tallying grain was an extra $25.
A dog tread power from the late 1800s manufactured in Troy, Pa., by the Enterprise Mfg. Co.: These powers were used to run small devices such as churns, cream separators and washing machines.