Barren Ground by Ellen Glasgow

When the spring came and the epidemic was over, she had won the loyal friendship of the poorer tenant farmers and the negro landowners; but her energy and her resilience were less than they had ever been in her life.

Machinery could not work alone, and even tractor-ploughs were obliged to be guided. She had installed an electric plant, and whenever it was possible, she had replaced hand labour by electricity. In the beginning she had dreaded the cost, but it was not long before she realized that the mysterious agency had been her safest investment. The separator in the dairy was run by electricity. With the touch of a button the skimmed milk was carried by pipes to the calf-yard or the hog-pen. Pumping, washing, churning, cooling the air in summer and warming it in winter, all these back-breaking tasks were entrusted to the invisible power which possessed the energy of human labour without the nerves that too often impeded it, and made it so uncertain a force.