The first patented dishwasher was made of what material?
The first dishwasher, patented in 1850 by Joel Houghton, wasn’t much more than a wooden box. It had scrubbers inside and used a hand-turned crank to splash water onto dishes. The dishwasher that we know and love today, however, was the brainchild of socialite Josephine Cochran in 1858. Cochran, tired of doing dishes by hand, utilized water pressure to create a much more effective machine out of copper.
Source: ThoughtCo