Henry Enfield Roscoe Edit Profile
Roscoe studied at the Liverpool Institute for Boys and University College London. He studied chemistry at the University of Heidelberg, Germany, in the 1850s after 1852. Roscoe received an honorary doctorate (LL.D) from the University of Glasgow in June 1901.
Roscoe began collaborating with Bunsen, and the two published a series of articles from 1854 to 1859 on the chemical action of light in photometry, actinometry and spectrum analysis. Considered by many historians to be the foundation of photochemistry, their work resulted in the formulation of the Bunsen and Roscoe Law, or the Reciprocity Law. It stated that the amount of a photochemical reaction depended upon the light energy absorbed, thus relating to the development of densities in a photographic emulsion. Later research by Schwarzschild, Sheppard, Mees and others found that the rule applied chiefly to moderate intensities of illumination. Bunsen and Roscoe also discovered that magnesium wire or ribbon could be used as a source of photographic light, and presented papers on this work in 1859 and 1864. They invented an apparatus for burning magnesium wire wound on spools and moved by clockwork, with the end of the wire being ignited by the flame of an alcohol lamp.
The Roscoe Building at the University of Manchester was named after Professor Roscoe: it is a large general-purpose teaching facility used for various levels of teaching in Brunswick Street.
1901University of Glasgow , honorary doctorate (LL.D)
1850 - 1852
1854 - 1859