Although people today have long been accustomed to the important role of washing machines in our lives, in fact, the development of washing machines has taken a long time.
American James King patented the first washing machine using a drum in 1851, but it had to be operated with one hand. In 1858, Hamilton Smith applied for a patent for the first rotary washing machine.
Less than 20 years later, in 1874, William Blackstone built the first washing machine designed for home use. Today’s washing machines are more convenient to operate and more versatile. Just by pressing a few keys people can complete various types of cleaning, and even control the water temperature.