Sketch based on photograph NPG Ax18347 by Henri Claudet, 1860s.
|26 December 1791
|18 October 1871
Charles Babbage (December 26, 1791 – October 18, 1871) was an English mathematician, philosopher, mechanical engineer, and (proto-) computer scientist, who originated the idea of a programmable computer. Parts of his uncompleted mechanisms are on display at the London Science Museum.
In 1991, working from Babbage's original plans, a difference engine was completed, and functioned perfectly. Built to tolerances achievable in the nineteenth century, the finished engine indicated that Babbage's machine would have worked. Nine years later, the Science Museum completed the printer Babbage had designed for the difference engine; it featured astonishing complexity for a nineteenth century device.
Charles Babbage was born in England, most likely at 44 Crosby Row, Walworth Road, London. A blue plaque on the junction of Larcom Street and Walworth Road commemorates the event. There was a discrepancy regarding the date of Babbage's birth, which was published in The Times obituary as December 26, 1792. However, days later, a nephew of Babbage wrote to say that Babbage was born precisely one year earlier, in 1791. The parish register of St. Mary's Newington, London, shows that Babbage was baptized on January 6, 1792.
Charles' father, Benjamin Babbage, was a banking partner of the Praeds who owned the Bitton Estate in Teignmouth. His mother was Betsy Plumleigh Babbage née Teape. In 1808, the Babbage family moved into the old Rowdens house in East Teignmouth, and Benjamin Babbage became a warden of the nearby St. Michael’s Church.
His father's money allowed Charles to receive instruction from several schools and tutors during the course of his elementary education. Around age eight he was sent to a country school in Alphington, near Exeter, to recover from a life-threatening fever. His parents ordered that his "brain was not to be taxed too much" and Babbage felt that "this great idleness may have led to some of my childish reasonings." For a short time he attended King Edward VI Grammar School in Totnes, South Devon, but his health forced him back to private tutors for a time. He then joined a 30-student Holmwood academy, in Baker Street, Enfield, Middlesex, under Reverend Stephen Freeman. The academy had a well-stocked library that prompted Babbage's love of mathematics. He studied with two more private tutors after leaving the academy. Of the first, a clergyman near Cambridge, Babbage said, "I fear I did not derive from it all the advantages that I might have done." The second was an Oxford tutor from whom Babbage learned enough of the Classics to be accepted to Cambridge.
Babbage arrived at Trinity College, Cambridge, in October 1810. He had read extensively in Leibniz, Lagrange, Simpson, and Lacroix, and was seriously disappointed in the mathematical instruction available at Cambridge. In response, he, John Herschel, George Peacock, and several other friends formed the Analytical Society in 1812.
In 1812 Babbage transferred to Peterhouse, Cambridge. He was the top mathematician at Peterhouse, but failed to graduate with honors. He instead received an honorary degree without examination in 1814.
On July 25, 1814, Babbage married Georgiana Whitmore at St. Michael's Church in Teignmouth, Devon. His father did not approve of the marriage. The couple lived at 5 Devonshire Street, Portland Place, London.
Charles and Georgiana had eight children, but only three lived to adulthood. Georgiana died in Worcester, September 1, 1827—moreover, Charles' father, wife, and at least two sons all died in 1827.
In recognition of the high error rate in the calculation of mathematical tables, Babbage wanted to find a method by which they could be calculated mechanically, removing human sources of error. Three different factors seem to have influenced him: A dislike of untidiness; his experience working on logarithmic tables; and existing work on calculating machines carried out by Wilhelm Schickard, Blaise Pascal, and Gottfried Leibniz. He first discussed the principles of a calculating engine in a letter to Sir Humphry Davy in 1822.
Babbage's engines were among the first mechanical computers. His engines were not actually completed, largely because of funding problems and personality issues. Babbage realized that a machine could do the work better and more reliably than a human being. Babbage controlled building of some steam-powered machines that more or less did their job; calculations could be mechanized to an extent. Although Babbage's machines were mechanical monsters, their basic architecture was astonishingly similar to a modern computer. The data and program memory were separated, operation was instruction based, control unit could make conditional jumps and the machine had a separate I/O unit.
In Babbage’s time, numerical tables were calculated by humans called "computers." At Cambridge, he saw the high error rate of the people computing the tables and, thus, started his life’s work in trying to calculate the tables mechanically, removing all human error. He began in 1822, with what he called the difference engine, made to compute values of polynomial functions.
Unlike similar efforts of the time, Babbage's difference engine was created to calculate a series of values automatically. By using the method of finite differences, it was possible to avoid the need for multiplication and division.
The first difference engine needed around 25,000 parts of a combined weight of fifteen tons standing eight feet high. Although he received much funding for the project, he did not complete it. He later designed an improved version, "Difference Engine No. 2." This was not constructed at the time, but was built using his plans in 1989-1991, to nineteenth century tolerances, and performed its first calculation at the London Science Museum bringing back results to 31 digits, far more than the average modern pocket calculator.
Babbage designed a printer for the second difference engine which had some remarkable features; it supported line-wrapping, variable column and row width, and programmable output formatting.
Soon after the attempt at making the difference engine crumbled, Babbage started designing a different, more complex machine called the Analytical Engine. The engine is not a single physical machine but a succession of designs that he tinkered with until his death in 1871. The main difference between the two engines is that the Analytical Engine could be programmed using punch cards, an idea unheard of in his time. He realized that programs could be put on similar cards so the person had to only create the program initially, and then put the cards in the machine and let it run. The analytical engine was also proposed to use loops of Jacquard's, punched cards to control a mechanical calculator, which could formulate results based on the results of preceding computations. This machine was also intended to employ several features subsequently used in modern computers, including sequential control, branching, and looping, and would have been the first mechanical device to be Turing-complete.
Ada Lovelace, an impressive mathematician and one of the few people who fully understood Babbage's vision, created a program for the Analytical Engine. Had the Analytical Engine ever actually been built, her program would have been able to calculate a numerical sequence known as the Bernoulli numbers. Based on this work, Ada is now credited as being the first computer programmer and, in 1979, a contemporary programming language was named Ada in her honor. Shortly afterward, in 1981, a satirical article by Tony Karp in Datamation magazine described the Babbage programming language as the "language of the future."
In 1824, Babbage won the Gold Medal of the Royal Astronomical Society "for his invention of an engine for calculating mathematical and astronomical tables."
From 1828 to 1839, Babbage was Lucasian professor of mathematics at Cambridge. He contributed largely to several scientific periodicals, and was instrumental in founding the Astronomical Society in 1820 and the Statistical Society in 1834. However, he dreamed of designing mechanical calculating machines.
I was sitting in the rooms of the Analytical Society, at Cambridge, my head leaning forward on the table in a kind of dreamy mood, with a table of logarithms lying open before me. Another member, coming into the room, and seeing me half asleep, called out, "Well, Babbage, what are you dreaming about?" to which I replied "I am thinking that all these tables" (pointing to the logarithms) "might be calculated by machinery."
In 1837, responding to the official eight Bridgewater Treatises "On the Power, Wisdom and Goodness of God, as manifested in the Creation," he published his Ninth Bridgewater Treatise, putting forward the thesis that God had the omnipotence and foresight to create as a divine legislator, making laws (or programs) which then produced species at the appropriate times, rather than continually interfering with ad hoc miracles each time a new species was required. The book is a work of natural theology, and incorporates extracts from correspondence he had been having with John Herschel on the subject.
Charles Babbage also achieved notable results in cryptography. He broke Vigenère's autokey cipher as well as the much weaker cipher that is called Vigenère cipher today. The autokey cipher was generally called "the undecipherable cipher," though owing to popular confusion, many thought that the weaker polyalphabetic cipher was the "undecipherable" one. Babbage's discovery was used to aid English military campaigns, and was not published until several years later; as a result credit for the development was instead given to Friedrich Kasiski, a Prussian infantry officer, who made the same discovery some years after Babbage.
Babbage also invented the pilot (also called a cow-catcher), the metal frame attached to the front of locomotives that clears the tracks of obstacles in 1838. He also constructed a dynamometer car and performed several studies on Isambard Kingdom Brunel's Great Western Railway around 1838. Charles' eldest son, Benjamin Herschel Babbage, worked as an engineer for Brunel on the railways before emigrating to Australia in the 1850s. Coincidentally, Charles Babbage and Brunel are both buried in London's Kensal Green Cemetery.
Babbage is also credited with the invention of standard railroad gauge, uniform postal rates, occulting lights for lighthouses, the heliograph, and the ophthalmoscope.
Babbage only once endeavored to enter public life, when, in 1832, he stood unsuccessfully for the borough of Finsbury. He came in last in the polls.
Babbage once counted all the broken panes of glass of a factory, publishing in 1857, a "Table of the Relative Frequency of the Causes of Breakage of Plate Glass Windows:" 14 of 464 were caused by "drunken men, women, or boys." His distaste for commoners ("the Mob") included writing "Observations of Street Nuisances" in 1864, as well as tallying up 165 "nuisances" over a period of 80 days; he especially hated street music. He was also obsessed with fire, once baking himself in an oven at 265°F (130°C) for four minutes "without any great discomfort" to "see what would happen." Later, he arranged to be lowered into Mount Vesuvius in order to view molten lava for himself.
On two occasions I have been asked,—"Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?" In one case a member of the Upper, and in the other a member of the Lower, House put this question. I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question (The Life of a Philosopher, 1864).
All links retrieved May 8, 2013.
Sir George Airy
|Lucasian Professor at Cambridge University
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