# Gauss, Karl Friedrich

**GAUSS, KARL FRIEDRICH** (1777-1855), German mathematician, was born of humble parents at Brunswick on the 30th of April 1777, and was
indebted for a liberal education to the notice which his talents procured him from the reigning duke. His name became widely known by the publication, in his
twenty-fifth year (1801), of the *Disquisitiones arithmeticae*. In 1807 he was appointed director of the Göttingen observatory, an office which he retained
to his death: it is said that he never slept away from under the roof of his observatory, except on one occasion, when he accepted an invitation from Baron von
Humboldt to attend a meeting of natural philosophers at Berlin. In 1809 he published at Hamburg his *Theoria motus corporum coelestium*, a work which gave
a powerful impulse to the true methods of astronomical observation; and his astronomical workings, observations, calculations of orbits of planets and comets,
etc., are very numerous and valuable. He continued his labours in the theory of numbers and other analytical subjects, and communicated a long series of memoirs
to the Royal Society of Sciences (*Königliche Gesellschaft der Wissenschaften*) at Göttingen. His first memoir on the theory of magnetism, *Intensitas
vis magneticae terrestris ad mensuram absolutam revocata*, was published in 1833, and he shortly afterwards proceeded, in conjunction with Wilhelm Weber, to
invent new apparatus for observing the earth's magnetism and its changes; the instruments devised by them were the declination instrument and the bifilar
magnetometer. With Weber's assistance he erected in 1833 at Göttingen a magnetic observatory free from iron (as Humboldt and F.J.D. Arago had previously done on
a smaller scale), where he made magnetic observations, and from this same observatory he sent telegraphic signals to the neighbouring town, thus showing the
practicability of an electromagnetic telegraph. He further instituted an association (*Magnetischer Verein*), composed at first almost entirely of Germans,
whose continuous observations on fixed term-days extended from Holland to Sicily. The volumes of their publication, *Resultate am den Beobachtungen des
magnetischen Vereins*, extend from 1836 to 1839; and in those for 1838 and 1839 are contained the two important memoirs by Gauss, *Allgemeine Theorie des
Erdmagnetismus, and the Allgemeine Lehrsätze* - on the theory of forces attracting according to the inverse square of the distance. The instruments and
methods thus due to him are substantially those employed in the magnetic observatories throughout the world. He co-operated in the Danish and Hanoverian
measurements of an arc and trigonometrical operations (1821-1848), and wrote (1843, 1846) the two memoirs *Uber Gegenstände der höheren Geodäsie*.
Connected with observations in general we have (1812-1826) the memoir *Theoria combinationis observationum erroribus minimis obnoxia*, with a second part
and a supplement. Another memoir of applied mathematics is the *Dioptrische Untersuchungen* (1840). Gauss was well versed in general literature and the
chief languages of modern Europe, and was a member of nearly all the leading scientific societies in Europe. He died at Göttingen on the 23rd of February 1855.
The centenary of his birth was celebrated (1877) at his native place, Brunswick.

Gauss's collected works were published by the Royal Society of Göttingen, in 7 vols. 4to (Gött., 1863-1871), edited by E.J. Schering - (1) the
*Disquisitiones arithmeticae*, (2) *Theory of Numbers*, (3) *Analysis*, (4) *Geometry and Method of Least Squares*, (5) *Mathematical
Physics*, (6) *Astronomy*, and (7) the *Theoria motus corporum coelestium*. Additional volumes have since been published, *Fundamente der
Geometrie usw*. (1900), and *Geodatische Nachträge zu Band iv*. (1903). They include, besides his various works and memoirs, notices by him of many of
these, and of works of other authors in the *Göttingen gelehrte Anzeigen*, and a considerable amount of previously unpublished matter, *Nachlass*. Of
the memoirs in pure mathematics, comprised for the most part in vols, ii., iii. and iv. (but to these must be added those on *Attractions* in vol. v.), it
may be safely said there is not one which has not signally contributed to the progress of the branch of mathematics to which it belongs, or which would not
require to be carefully analysed in a history of the subject. Running through these volumes in order, we have in the second the memoir, *Summatio quarundam
serierum singularium*, the memoirs on the theory of biquadratic residues, in which the notion of complex numbers of the form *a* + *bi* was first
introduced into the theory of numbers; and included in the *Nachlass* are some valuable tables. That for the conversion of a fraction into decimals (giving
the complete period for all the prime numbers up to 997) is a specimen of the extraordinary love which Gauss had for long arithmetical calculations; and the
amount of work gone through in the construction of the table of the number of the classes of binary quadratic forms must also have been tremendous. In vol. iii.
we have memoirs relating to the proof of the theorem that every numerical equation has a real or imaginary root, the memoir on the *Hypergeometric Series*,
that on *Interpolation*, and the memoir *Determinatio attractionis* - in which a planetary mass is considered as distributed over its orbit according
to the time in which each portion of the orbit is described, and the question (having an implied reference to the theory of secular perturbations) is to find
the attraction of such a ring. In the solution the value of an elliptic function is found by means of the *arithmetico-geometrical mean*. The
*Nachlass* contains further researches on this subject, and also researches (unfortunately very fragmentary) on the lemniscate-function, &., showing
that Gauss was, even before 1800, in possession of many of the discoveries which have made the names of N.H. Abel and K.G.J. Jacobi illustrious. In vol. iv. we
have the memoir *Allgemeine Auflösung*, on the graphical representation of one surface upon another, and the *Disquisitiones generales circa superficies
curvas*. (An account of the treatment of surfaces which he originated in this paper will be found in the article Surface.) And in vol. v. we have a memoir
*On the Attraction of Homogeneous Ellipsoids*, and the already mentioned memoir *Allgemeine Lehrsätze*, on the theory of forces attracting according
to the inverse square of the distance.

(A. Ca.)

*Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)*