Ludwig A. Colding

Ludwig August Colding (13 July 1815 – 21 March 1888) was a Danish civil engineer and physicist who articulated the principle of conservation of energy contemporaneously with, and independently of, James Prescott Joule and Julius Robert von Mayer though his contribution was largely overlooked and neglected.

Born in Holbæk, Denmark, his father, Andreas Christian, had been an officer in the Danish privateer service. Ludwig's mother, Anna Sophie, was the daughter of a clergyman and imbued the household with a deeply religious sentiment. Around the time of Ludwig's birth, his father retired from seafaring and took up a position as a farm manager. He seems to have been particularly unsuited to such a profession and this, together with the upheavals of the Napoleonic Wars in Denmark, subjected the young Ludwig to a rather irregular childhood and schooling.

Hans Christian Ørsted was an old family friend and arranged for Colding to serve an apprenticeship under a craftsman in Copenhagen, Colding achieving the status of journeyman in 1836. Ørsted had, by this stage, become something of a mentor to the young Colding and encouraged him to enroll at the Copenhagen Polytechnic Institute. The Institute had been founded at Ørsted's initiative and he offered continual advice and support to the young Colding. At the polytechnic Colding showed the most undaunted diligence and the most conscientious precision and in 1839 Ørsted engaged Colding to assist on some exacting measurements of the release of heat by compressed water.

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