Humboldt had devised a calendar for observations of magnetic declination. However, once Gauss's new magnetic observatory (completed in 1833 - free of all magnetic metals) had been built, he proceeded to alter many of Humboldt's procedures, not pleasing Humboldt greatly. However, Gauss's changes obtained more accurate results with less effort.
Gauss and Weber achieved much in their six years together. They discovered Kirchhoff's laws, as well as building a primitive telegraph device which could send messages over a distance of 5000 ft. However, this was just an enjoyable pastime for Gauss. He was more interested in the task of establishing a world-wide net of magnetic observation points. This occupation produced many concrete results. The Magnetischer Verein and its journal were founded, and the atlas of geomagnetism was published, while Gauss and Weber's own journal in which their results were published ran from 1836 to 1841.
In 1837, Weber was forced to leave Göttingen when he became involved in a political dispute and, from this time, Gauss's activity gradually decreased. He still produced letters in response to fellow scientists' discoveries usually remarking that he had known the methods for years but had never felt the need to publish. Sometimes he seemed extremely pleased with advances made by other mathematicians, particularly that of Eisenstein and of Lobachevsky.
Gauss spent the years from 1845 to 1851 updating the Göttingen University widow's fund. This work gave him practical experience in financial matters, and he went on to make his fortune through shrewd investments in bonds issued by private companies.
Two of Gauss's last doctoral students were Moritz Cantor and Dedekind. Dedekind wrote a fine description of his supervisor
... usually he sat in a comfortable attitude, looking down, slightly stooped, with hands folded above his lap. He spoke quite freely, very clearly, simply and plainly: but when he wanted to emphasise a new viewpoint ... then he lifted his head, turned to one of those sitting next to him, and gazed at him with his beautiful, penetrating blue eyes during the emphatic speech. ... If he proceeded from an explanation of principles to the development of mathematical formulas, then he got up, and in a stately very upright posture he wrote on a blackboard beside him in his peculiarly beautiful handwriting: he always succeeded through economy and deliberate arrangement in making do with a rather small space. For numerical examples, on whose careful completion he placed special value, he brought along the requisite data on little slips of paper.
Gauss presented his golden jubilee lecture in 1849, fifty years after his diploma had been granted by Helmstedt University. It was appropriately a variation on his dissertation of 1799. From the mathematical community only Jacobi and Dirichlet were present, but Gauss received many messages and honours.
From 1850 onwards Gauss's work was again nearly all of a practical nature although he did approve Riemann's doctoral thesis and heard his probationary lecture. His last known scientific exchange was with Gerling. He discussed a modified Foucault pendulum in 1854. He was also able to attend the opening of the new railway link between Hanover and Göttingen, but this proved to be his last outing. His health deteriorated slowly, and Gauss died in his sleep early in the morning of 23 February, 1855.
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Humboldt 構想了一本日曆為磁性傾向的觀察。但是, 1833 年一旦高斯的新磁性觀測所(被完成- 免於所有磁性金屬) 被修造了, 他進行修改許多Humboldt 的規程, 不很大地取樂Humboldt 。但是, 高斯的變動獲得了更加準確的結果以較少努力。 高斯和Weber 一起達到了在他們的六年。他們發現了Kirchhoff 的法律, 並且建立能送信在距離5000 ft 的一個原始通信機設備。但是, 這是正義的令人愉快的消遣為高斯。他是對建立感興趣磁性觀察點全世界網任務。這種職業導致了許多具體結果。Magnetischer Verein 和它的學報建立了, 並且geomagnetism 地圖集被出版了, 當裡他們的結果被出版的高斯和Weber 的自己的學報在跑了從1836 年到1841 年。 1837 年, Weber 被迫把G5ottingen 留在當他變得介入政治爭執並且, 從這時間, 高斯的活動逐漸減少了。他仍然導致了信件以回應科學家的發現通常陳述, 他知道方法幾年來但從未感到了需要出版。有時他似乎極端喜悅對前進由其它數學家, 特別那艾森斯坦和Lobachevsky 做。 高斯被花費歲月從1845 年到1851 年更新G5ottingen 大學寡婦的資金。這工作給了他實踐經驗在金融事件, 並且他做他的時運通過敏銳投資在債券由私人公司發布。 二高斯的前名博士學生是Moritz 領唱者和Dedekind 。Dedekind 寫了他的監督員的一個美好的描述 ... 他通常坐了在舒適的態度, 看下來, 輕微地被彎身, 用手被摺疊在他的膝部之上。他相當自由地, 非常清楚, 簡單地和簡單地講了話: 但當他想強調一個新觀點... 然後他舉了他的頭, 轉向了那些的當中一個坐在他旁邊, 和注視了他與他美麗, 擊穿的藍眼睛在強調講話期間... 如果他進行了從原則的解釋對數學公式的發展, 那麼他起來了, 並且在一個莊嚴非常挺直姿勢他寫在一個黑板在他旁邊用他的奇怪地美好的手寫: 他總成功通過經濟和故意安排在湊合用相當小空間。為數字例子, 在仔細的完成他安置特別價值, 他帶來沿關於小的條子的必須資料。 1849 年高斯提出了他的金黃週年紀念演講, 在他的文憑由Helmstedt University 五十年授予了之後。這適當地是變異在1799 的他的學術論文年。從數學社區唯一Jacobi 和Dirichlet 是存在, 但是高斯接受了許多消息和榮譽。 從1850 年往前高斯的工作再是幾乎所有有一種實用品質雖然他批准了Riemann 的博士論文和聽取了他的試用演講。他的前已知的科學交換是與Gerling 。1854 年他談論了一把修改過的Foucault 擺錘。他還能出席新鐵路鏈接的開頭在漢諾威和G5ottingen 之間, 但這被證明是他的前遠足。他的健康慢慢地惡化了, 和高斯死在他的睡眠及早1855 年的2月23 日, 早晨。
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