Exhibits At the Museum

This Day in History

Today: March 27, 2015
The Harvard Mark I

February 8, 1945

A Patent is Filed for the Harvard Mark I

C.D Lake, H.H. Aiken, F.E. Hamilton, and B.M. Durfee file a calculator patent for the Automatic Sequence Control Calculator, commonly known as the Harvard Mark I. The Mark I was a large automatic digital computer that could perform the four basic arithmetic functions and handle 23 decimal places. A multiplication took about five seconds.