Henri Victor Regnault French physicist and chemist (b. 1810)
Henri Victor Regnault (21 July 1810 – 19 January 1878) was a French chemist and physicist best known for his careful measurements of the thermal properties of gases. He was an early thermodynamicist and was mentor to William Thomson in the late 1840s. He never used his first given name, and was known throughout his lifetime as Victor Regnault.

1878Jan, 19
Henri Victor Regnault
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Events on 1878
- 18Feb
Lincoln County War
John Tunstall is murdered by outlaw Jesse Evans, sparking the Lincoln County War in Lincoln County, New Mexico. - 3Mar
Treaty of San Stefano
The Russo-Turkish War ends with Bulgaria regaining its independence from the Ottoman Empire according to the Treaty of San Stefano; a few months afterwards the Congress of Berlin stripped its status to a vassal principality of the Ottoman Empire. - 25May
Comic opera
Gilbert and Sullivan's comic opera H.M.S. Pinafore opens at the Opera Comique in London. - 10Jun
Treaty of San Stefano
League of Prizren is established, to oppose the decisions of the Congress of Berlin and the Treaty of San Stefano, as a consequence of which the Albanian lands in Balkans were being partitioned and given to the neighbor states of Serbia, Montenegro, Bulgaria and Greece. - 22Oct
Salford, Greater Manchester
The first rugby match under floodlights takes place in Salford, between Broughton and Swinton.