Andy Aaron is designer who creates unique antique-styled calculators. He creates only a few of such devices per year and every of them is unique in its own way. He says that his calculating machines could fit in some office from th 19th century or before.
Those calculating machines are powered by electricity but they are done with the parts that could be available in 19th century. One of them reminds me on ancient Chinese calculating machine called Abacus. Find more on author site .
