In 1831 he became the first professor of chemistry at the newly founded King's College London; and in 1835 he was appointed to the equivalent post at the East India Company's Military Seminary at Addiscombe, Surrey.

He also invented the dew-point hygrometer known by his name,[3] and a register pyrometer;[4] and in 1830 he erected in the hall of the Royal Society a water-barometer, with which he carried out a large number of observations.

[5] A process devised by him for the manufacture of illuminating gas from turpentine and resin was in use in New York City for a time.

[1] Daniell's publications included Meteorological Essays (1823), an Essay on Artificial Climate considered in its Applications to Horticulture (1824), which showed the necessity of a humid atmosphere in hothouses devoted to tropical plants, and an Introduction to the Study of Chemical Philosophy (1839).

Daniell died suddenly of apoplexy in London in March 1845, while attending a meeting of the council of the Royal Society, of which he had become a fellow in 1813 and Foreign Secretary in 1839.