Herman Hollerith a American statistician who developed a mechanical tabulator based on punched cards. He used this machine for calculation and analysis of census data.
During 1880 he became the census officer of U.S.A. He used this machine for calculating U.S census and tabulating them. The machine was a huge success which made Hollerith filed his first patent application for the machine under the title "Art of Compiling Statistics”.
Tabulation of the census is a very huge process and this machine can be useful for countries like India and U.S where the population is very high.