Although the 1880 census had taken only a few months, the work of tabulating and analyzing the data promised to drag on for years.

He designed a special puncher (a pantograph punch consisting of a template and two connected punches); when the operator punched the template, the second puncher perforated the card. Hollerith’s invention of the computation machine is what earned him a PhD in 1890. View larger image Hollerith's electronic tabulator, 1902. Herman Hollerith should be given the youngest inventor award for he invented the tabulating machine when he was just 7.25 years old. The information might be data for data processing applications or, as in earlier times, used to directly control automated machinery. This is the first time that a machine was able to successfully process information efficiently enough to be able to replace the pen and paper method.

Wait, 7.25? It consisted of a continuous roll of tally sheets wound on a set of spools in a wooden box. In the first tally, the Census broke down the population by sex, race, and birthplace; in other tallies, it collated these statistics with literacy, occupation, and other characteristics. In 1896, Hollerith founded the Tabulating Machine Company to sell his invention, the Company became part of IBM in 1924. Hollerith's punch card system received a great deal of attention in the popular and scientific press in the USA and abroad and was featured on the front tape of the 30 August 1890 issue of Scientific American (see it below). This led Herman to create an 80-column cardboard card, on which the questions could be answered with perforations in certain positions. After observing a train conductor punching railroad tickets to identify passengers, Hollerith conceived and developed the idea of using punched holes to record facts about people. In 1879 the bright and unmanageable teenager Herman Hollerith (see biography of Herman Hollerith) graduated with distinction at School of Mines at Columbia University in New York (but with low marks only in bookkeeping and machines) and went to work as a special agent for the US Census Office in Washington, D.C. One of his professors of engineering, William P. Trowbridge (1828-1892), engaged for the Census as an expert special agent, got the job for him. Hollerith was born in 1860 to German immigrant parents in Buffalo, New York. Herman Hollerith and Computer Punch Cards. It seems Hollerith came to a dead end, forgetting for the Billings' idea of punch cards. No. This tape consisted of fields marked with ink, in which data could be encoded, perforating it or not, depending on the data to be recorded.

Some operators handled 9200 schedules, listing 50000 people, in a single day.

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