Write short notes on the achievement of the following computer scientists. a) Howard Aiken b) Herman Hollerith

a) Howard Aiken: Howard H. Aiken designed and built the IBM ASCC (Automatic Sequence Control Calculator) the first digital computer in the United States to work from a program and produce reliable results. The machine was also called Mark I.

- It was 51 ft long, 8 ft height and 3 ft wide.

- 18,000 vacuum tubes were used.

- It consists of 7 lakhs 50 thousand parts.

- Cable connections were nearly 500 miles long.

Herman Hollerith: Herman Hollerith made a major contribution to the development of the modern digital computer with his tabulating machine. An early model of his invention was first used in 1890 to tabulate medical statistics gathered by the United States Army. That same year, the United States Census Bureau adopted Hollerith’s tabulating system for its 1890 census. His tabulating machine used punch card invented in the early 1800s, by a French silk weaver called Joseph-Marie Jacquard. His device could automatically read information which had been punched into card. He is also a founder of IBM Company which is still popular.