Sepia-toned photograph of the Scottish village Kinlochleven. Kinlochleven is the home to a gravity dam and water supply system that powered the aluminum production for the British Aluminium Company.

Porcelain mortar owned by Georg Bredig (1868-1944). Mortar and pestles are used to manually grind or crush a sample into a fine powder.

Black and white printed portrait of August Friedrich Horstmann (1842-1929), a German physical chemist who worked in the field of thermodynamics.

Carl Wilhelm Scheele (1742-1786) was a German-Swedish pharmaceutical chemist whose discoveries include oxygen and chlorine gas.

Carl Wilhelm Scheele (1742-1786) was a German-Swedish pharmaceutical chemist whose discoveries include oxygen and chlorine gas.

Portrait of Ernst Cohen (1869-1944), a Dutch scientist and professor, who was known for his research in the allotropy of tin. Cohen worked under Svante Arrhenius (1859-1927), Henri Moissan (1852-1907), and Jacobus van…

Portrait of Ernst Mach (1838 -1916) an Austrian physicist and philosopher.

Black and white portrait of Friedrich Kohlrausch (1840 -1910).

Kohlrausch was a German experimental physicist who researched electrolytes, elasticity, thermal conduction, and magnetic and electrical precision…

Friedrich Wöhler (1800 -1882) was a German chemist and professor of chemistry at the University of Göttingen. He specialized in inorganic chemistry and was the first scientist to isolate beryllium and yttrium in pure…

Postcard featuring a photograph of Gustav Heinrich Johann Apollon Tammann (1861-1938). Tammann was a Baltic German physical chemist. He worked in the fields of metallurgy and studied the physical properties of metals…

Sepia toned photograph of H. Jermain Creighton. The lower right has a note from Creighton to Georg Bredig (1868-1944).

Creighton was the head of the chemistry department at Swarthmore College, Pennsylvania in 1928. He…

Portrait of Hans Heinrich Landolt (1831-1910). Landolt was a Swiss chemist who discovered the iodine clock reaction. He was additionally a co-founder of the Landolt–Börnstein database.

Portrait of Hans Luggins (1863-1899), taken by Anna Edlund in Stockholm, Sweden.

Portrait of Hendrik Antoon Lorentz (1853-1902) wearing a suit and a bow tie.

Lorentz was a Dutch physicist. In 1902, he was awarded the Nobel Prize in Physics with Pieter Zeeman (1865-1943) for their discovery of the…

Hermann Franz Moritz Kopp (1817–92) was a German physical chemist and historian of chemistry. Kopp is well-known for his four volume work, Geschichte der Chemie (History of Chemistry), which was published between…

Portrait of Hermann von Helmholtz (1821-1894).

Hermann von Helmholtz (1821-1894) was a German mathematician and physician who made significant contributions to the fields of mathematical physics, optics, acoustics, physiology, and psychology. The Helmholtz…

Portrait of Jacob Maarten van Bemmelen (1830-1911), a Dutch chemist who worked in agricultural chemistry.

Jeremias Benjamin Richter (1762 – 1807) was a German chemist and mining official. He introduced the term stoichiometry, which is the study of the quantifiable relationships between two or more substances undergoing a…

Portrait of Johann Wilhelm Hittorf (1824-1914).

John Hall Gladstone (1827-1902) was a British chemist who worked on the bromination of rubber, optics, and
spectroscopy.

Portrait of Josiah Willard Gibbs (1839-1903). Gibbs, a Yale alumnus, was an American chemist and pioneer in the field of physical chemistry. Gibbs developed statistical mechanics and the concept of Gibbs free energy in…