Historically Speaking,— A history of computers, II
Jules A. Larrivee · Mathematics Teacher Learning and Teaching PK-12 · 1958
The idea of using telephone relays as components of an automatic digital computer was first introduced by G. R. Stibitz, and a computer built along these lines was demonstrated in 1940. Since that time improvements have been made and several such computers built by Bell Telephone Laboratories are in daily use.