In the early days pumpjacks worked by rod lines running horizontally above the ground to a wheel on a rotating eccentric in a mechanism known as a central power.
Air balanced pump jack.
The central power which might operate a dozen or more pumpjacks would be powered by a steam or internal combustion engine or by an electric motor.
Schlumberger conventional crank balanced and beam balanced pumping units are among the most respected and recognized brands in the rod pumping industry offering reliable cost effective performance at a competitive price.
Pumping heavy sweet crude from the heath formation just north of dickinson nd.