Dishwashers have come a long way since this 1921 model, which was designed mainly to help minimize the drudgery of housework. But today’s sleek models are also designed with water conservation in mind.

Dishwashers have come a long way since this 1921 model, which was designed mainly to help minimize the drudgery of housework. But today’s sleek models are also designed with water conservation in mind.