Difference engine

Charles Babbage's difference engines

Charles Babbage began to construct a small difference engine in c. 1819^[4] and had completed it by 1822 (Difference Engine 0).^[5] He announced his invention on 14 June 1822, in a paper to the Royal Astronomical Society, entitled "Note on the application of machinery to the computation of astronomical and mathematical tables".^[6] This machine used the decimal number system and was powered by cranking a handle. The British government was interested, since producing tables was time-consuming and expensive and they hoped the difference engine would make the task more economical.^[7]

In 1823, the British government gave Babbage £1700 to start work on the project. Although Babbage's design was feasible, the metalworking techniques of the era could not economically make parts in the precision and quantity required. Thus the implementation proved to be much more expensive and doubtful of success than the government's initial estimate. According to the 1830 design for Difference Engine No. 1, it would have about 25,000 parts, weigh 4 tons,^[8] and operate on 20-digit numbers by sixth-order differences. In 1832, Babbage and Joseph Clement produced a small working model (one-seventh of the plan),^[5] which operated on 6-digit numbers by second-order differences.^[9][10] Lady Byron described seeing the working prototype in 1833: "We both went to see the thinking machine (or so it seems) last Monday. It raised several Nos. to the 2nd and 3rd powers, and extracted the root of a Quadratic equation."^[11] Lady Byron's daughter Ada Lovelace would later become fascinated with and work on creating the first computer program intended to solve Bernoulli's equation utilizing the difference engine. Work on the larger engine was suspended in 1833.

By the time the government abandoned the project in 1842,^[10][12] Babbage had received and spent over £17,000 on development, which still fell short of achieving a working engine. The government valued only the machine's output (economically produced tables), not the development (at unpredictable cost) of the machine itself. Babbage refused to recognize that predicament.^[7] Meanwhile, Babbage's attention had moved on to developing an analytical engine, further undermining the government's confidence in the eventual success of the difference engine. By improving the concept as an analytical engine, Babbage had made the difference engine concept obsolete, and the project to implement it an utter failure in the view of the government.^[7]

The incomplete Difference Engine No. 1 was put on display to the public at the 1862 International Exhibition in South Kensington, London.^[13][14]

Babbage went on to design his much more general analytical engine, but later designed an improved "Difference Engine No. 2" design (31-digit numbers and seventh-order differences),^[9] between 1846 and 1849. Babbage was able to take advantage of ideas developed for the analytical engine to make the new difference engine calculate more quickly while using fewer parts.^[15][16]

Scheutzian calculation engine

Inspired by Babbage's difference engine in 1834, the Swedish inventor Per Georg Scheutz built several experimental models. In 1837 his son Edvard proposed to construct a working model in metal, and in 1840 finished the calculating part, capable of calculating series with 5-digit numbers and first-order differences, which was later extended to third-order (1842). In 1843, after adding the printing part, the model was completed.

In 1851, funded by the government, construction of the larger and improved (15-digit numbers and fourth-order differences) machine began, and finished in 1853. The machine was demonstrated at the World's Fair in Paris, 1855 and then sold in 1856 to the Dudley Observatory in Albany, New York. Delivered in 1857, it was the first printing calculator sold.^[17][18][19] In 1857 the British government ordered the next Scheutz's difference machine, which was built in 1859.^[20][21] It had the same basic construction as the previous one, weighing about 10 cwt (1,100 lb; 510 kg).^[19]

Others

Martin Wiberg improved Scheutz's construction (c. 1859, his machine has the same capacity as Scheutz's: 30-digit and sixth-order) but used his device only for producing and publishing printed tables (interest tables in 1860, and logarithmic tables in 1875).^[22]

Alfred Deacon of London in c. 1862 produced a small difference engine (20-digit numbers and third-order differences).^[17][23]

American George B. Grant started working on his calculating machine in 1869, unaware of the works of Babbage and Scheutz (Schentz). One year later (1870) he learned about difference engines and proceeded to design one himself, describing his construction in 1871. In 1874 the Boston Thursday Club raised a subscription for the construction of a large-scale model, which was built in 1876. It could be expanded to enhance precision and weighed about 2,000 pounds (910 kg).^[23][24][25]

Christel Hamann built one machine (16-digit numbers and second-order differences) in 1909 for the "Tables of Bauschinger and Peters" ("Logarithmic-Trigonometrical Tables with eight decimal places"), which was first published in Leipzig in 1910. It weighed about 40 kilograms (88 lb).^[23][26][27]

Burroughs Corporation in about 1912 built a machine for the Nautical Almanac Office which was used as a difference engine of second-order.^{[28]: 451 [29]} It was later replaced in 1929 by a Burroughs Class 11 (13-digit numbers and second-order differences, or 11-digit numbers and [at least up to] fifth-order differences).^[30]

Alexander John Thompson about 1927 built integrating and differencing machine (13-digit numbers and fifth-order differences) for his table of logarithms "Logarithmetica britannica". This machine was composed of four modified Triumphator calculators.^[31][32][33]

Leslie Comrie in 1928 described how to use the Brunsviga-Dupla calculating machine as a difference engine of second-order (15-digit numbers).^[28] He also noted in 1931 that National Accounting Machine Class 3000 could be used as a difference engine of sixth-order.^{[23]: 137–138}

Construction of two working No. 2 difference engines

During the 1980s, Allan G. Bromley, an associate professor at the University of Sydney, Australia, studied Babbage's original drawings for the Difference and Analytical Engines at the Science Museum library in London.^[34] This work led the Science Museum to construct a working calculating section of difference engine No. 2 from 1985 to 1991, under Doron Swade, the then Curator of Computing. This was to celebrate the 200th anniversary of Babbage's birth in 1991. In 2002, the printer which Babbage originally designed for the difference engine was also completed.^[35] The conversion of the original design drawings into drawings suitable for engineering manufacturers' use revealed some minor errors in Babbage's design (possibly introduced as a protection in case the plans were stolen),^[36] which had to be corrected. The difference engine and printer were constructed to tolerances achievable with 19th-century technology, resolving a long-standing debate as to whether Babbage's design could have worked using Georgian-era engineering methods. The machine contains 8,000 parts and weighs about 5 tons.^[37]

The printer's primary purpose is to produce stereotype plates for use in printing presses, which it does by pressing type into soft plaster to create a flong. Babbage intended that the Engine's results be conveyed directly to mass printing, having recognized that many errors in previous tables were not the result of human calculating mistakes but from slips in the manual typesetting process.^[7] The printer's paper output is mainly a means of checking the engine's performance.

In addition to funding the construction of the output mechanism for the Science Museum's difference engine, Nathan Myhrvold commissioned the construction of a second complete Difference Engine No. 2, which was on exhibit at the Computer History Museum in Mountain View, California, from May 2008 to January 2016.^{[37][38][39][40]} It has since been transferred to Intellectual Ventures in Seattle where it is on display just outside the main lobby.^[41][42][43]

Timing

In the Babbage design, one iteration (i.e. one full set of addition and carry operations) happens for each rotation of the main shaft. Odd and even columns alternately perform an addition in one cycle. The sequence of operations for column ${\displaystyle n}$ is thus:^[44]

1. Count up, receiving the value from column ${\displaystyle n+1}$ (Addition step)
2. Perform carry propagation on the counted up value
3. Count down to zero, adding to column ${\displaystyle n-1}$
4. Reset the counted-down value to its original value

Steps 1,2,3,4 occur for every odd column, while steps 3,4,1,2 occur for every even column.

While Babbage's original design placed the crank directly on the main shaft, it was later realized that the force required to crank the machine would have been too great for a human to handle comfortably. Therefore, the two models that were built incorporate a 4:1 reduction gear at the crank, and four revolutions of the crank are required to perform one full cycle.

Steps

Each iteration creates a new result, and is accomplished in four steps corresponding to four complete turns of the handle shown at the far right in the picture below. The four steps are:

1. All even numbered columns (2,4,6,8) are added to all odd numbered columns (1,3,5,7) simultaneously. An interior sweep arm turns each even column to cause whatever number is on each wheel to count down to zero. As a wheel turns to zero, it transfers its value to a sector gear located between the odd/even columns. These values are transferred to the odd column causing them to count up. Any odd column value that passes from "9" to "0" activates a carry lever.
2. For the odd columns, any carry levers in the activated state cause the adjacent digit to be incremented by 1. This carry operation is applied sequentially to allow carries to propagate. Meanwhile, the even columns are returned to their original values.
3. This is like Step 1, except it is odd columns (3,5,7) added to even columns (2,4,6), and column one has its values transferred by a sector gear to the print mechanism on the left end of the engine. Any even column value that passes from "9" to "0" activates a carry lever. The column 1 value, the result for the polynomial, is sent to the attached printer mechanism.
4. This is like Step 2, but for doing carries on even columns, and returning odd columns to their original values.

Subtraction

The engine represents negative numbers as ten's complements. Subtraction amounts to addition of a negative number. This works in the same manner that modern computers perform subtraction, known as two's complement.

Use of derivatives

Many commonly used functions are analytic functions, which can be expressed as power series, for example as a Taylor series. The initial values can be calculated to any degree of accuracy; if done correctly the engine will give exact results for first N steps. After that, the engine will only give an approximation of the function.

The Taylor series expresses the function as a sum obtained from its derivatives at one point. For many functions the higher derivatives are trivial to obtain; for instance, the sine function at 0 has values of 0 or ${\displaystyle \pm 1}$ for all derivatives. Setting 0 as the start of computation we get the simplified Maclaurin series

${\displaystyle \sum _{n=0}^{\infty }{\frac {f^{(n)}(0)}{n!}}\ x^{n}}$

The same method of calculating the initial values from the coefficients can be used as for polynomial functions. The polynomial constant coefficients will now have the value

${\displaystyle a_{n}\equiv {\frac {f^{(n)}(0)}{n!}}}$

Curve fitting

The problem with the methods described above is that errors will accumulate and the series will tend to diverge from the true function. A solution which guarantees a constant maximum error is to use curve fitting. A minimum of N values are calculated evenly spaced along the range of the desired calculations. Using a curve fitting technique like Gaussian reduction an N−1th degree polynomial interpolation of the function is found.^[46] With the optimized polynomial, the initial values can be calculated as above.