Text У. THE FIRST CALCULATING DEVICES

Let us take a look at the history of computers that we know today. The very first calculating device used was the ten fingers of a man's hands. This, in fact, is why today we still count in tens and multiples of tens.

Then the abacus was invented. People went on using some form of abacus well into the 16^th century, and it is still being used in some parts of the world because it can be understood with­out knowing how to read.

During the 17^th and I8^lh centuries many people tried to find easy ways of calculating. J.Napier, a Scotsman, invented a me­chanical way of multiplying and dividing, which is now the modern slide rale works. Henry Briggs used Napier's ideas to • produce logarithm tables which all mathematicians use today.

Calculus, another branch of mathematics, was independently invented by both Sir Isaak Newton, an Englishman, and Leib­nitz, a German mathematician. The first real calculating ma­chine appeared in 1820 as the result of several people's experi­ments.

In 1830 Charles Babbage, a gifted English mathematician, proposed to build a general-purpose problem-solving machine that he called "the analytical engine". This machine, which Babbage showed at the Paris Exhibition in 1855, was an attempt to cut out the human being altogether, except for providing the machine with the necessary facts about the problem to be solved. He never finished this work, but many of his ideas were the ba­sis for building today's computers.

By the early part of the twentieth century electromechani­cal machines had been developed and were used for business data processing. Dr. Herman Hollerith, a young statistician from the US Census Bureau successfully tabulated the 1890 census. Hollerith invented a means of coding the data by punching holes into cards. He built one machine to punch the holes and others — to tabulate the collected data. Later Hollerith left the Census

Bureau and established his own tabulating machine company. Through a series of merges the company eventually became the IBM Corporation.

Until the middle of the twentieth century machines designed to manipulate punched card data were widely used for business data processing. These early electromechanical data processors were called unit record machines because each punched card contained a unit of data.

In the mid—1940s electronic computers were developed to perform calculations for military and scientific purposes. By the end of the 1960s commercial models of these computers were widely used for both scientific computation and business data processing. Initially these computers accepted their input data from punched cards. By the late 1970s punched cards had been almost universally replaced by keyboard terminals. Since that. time advances in science have led to the proliferation of com­puters throughout our society, and the past is but the prologue that gives us a glimpse of the nature.

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1. What was the very first calculating device? 2. What is the abacus? 3. What is the modern slide rule? 4. Who gave the ideas for producing logarithm tables? 5. How did Newton and Leib­nitz contribute to the problem of calculation? 6. When did the first calculating machine appear? 7. What was the main idea of. Ch.Babbage's machine? 8. How did electromechanical ma­chines appear and what were they used for? 9. What means of

33 Unit 3. History of Computers

coding the data did Hollerith devise? 10. How were those elec­tromechanical machines called and why? 11. What kind of com­puters appeared later? 12. What new had the computers of 1970s?

4. Найдите в тексте английские эквиваленты следующих
словосочетаний:

Вычислительное устройство; легкий способ вычисления; поэтому (вот почему); кратное десяти; изобрести механи­ческий способ умножения и деления; логарифмическая линейка; составить таблицы логарифмов; математический анализ; изобрести независимо (друг от друга); в результа­те; полностью исключить человека; кроме (за исключени­ем); обработка деловой информации; средство кодирова­ния информации; перфокарты; пробивать отверстия; оформить собранные данные в таблицу; работать с данны­ми на перфокарте; устройство, записывающее информа­цию блоками; единица информации; выполнять вычисле­ния; для научных целей; клавишный терминал