James Joules


Biographical Sketch of James JoulesJames Prescott Joule an English physicist, who studied under John Dalton. Famous for Joule's Law, the production of heat by voltaic electricity. --- Image by © AS400 DB/Corbis

James Joule FRS, an English physicist, discovered the law of conservation of energy – the relationship between natural heat to mechanical work

Born in England, 1818-1889
Developed the first law of thermodynamics and established Joule’s Law – a unit of energy measurement (joule)

The Royal Society, Fellow
Manchester Literary and Philosophical Society, President (1860)
British Association for the Advancement of Science, President (1872, 1887)


Royal Medal
Copley Medal
Albert Medal

Joule’s Declarations

“[I]t is evident that an acquaintance with natural laws means no less than an acquaintance with the mind of God therein expressed.”

“[T]he phenomena of nature, whether mechanical, chemical, or vital, consist almost entirely in a continual conversion … into one another. Thus it is that order is maintained in the universe—nothing is deranged, nothing ever lost, but the entire machinery, complicated as it is, works smoothly and harmoniously … the whole being governed by the sovereign will of God.”

James Joules





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Darwin, Then and Now is a journey through the most amazing story in the history of science - the history of evolution. The book encapsulates who Darwin was, what he said, and what scientists have discovered since the publication of The Origin of Species in 1859.

With over 1,000 references, Darwin Then and Now is a historical chronicle of the rise and fall of the once popular theory of biological evolution.