History of Computers and Computing, The birth of the modern computer, First relays computers

The relay computers were huge, slow, expensive, and often undependable machines, but nevertheless they deserve our attention, because they were the first digital computers and traced the path for their smarter brothers—the electronic computers.

Konrad Zuse computers

Howard Hathaway AikenMARK computers

George Robert Stibitz—Complex Number Computer

Edward Condon—Nimatron