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Mary Ellen Richmond (1861–1928) was an American social work pioneer. She is regarded as the mother of professional social work along with Jane Addams.She founded social case work, the first method of social work and was herself a Caseworker.
In 1885, at the age of 21, Yai invented a continuous electric clock powered by wet-cell batteries. Electrically-powered clocks already existed, but they had conventional spring-powered clockwork movements , with electricity used to wind up the spring, while Yai's was a breakthrough, powered directly by a battery he had made. [ 2 ]
Grace Longwell Coyle was born in North Adams, Massachusetts, in 1892.Her parents were John Patterson Coyle, a Congregational minister, and Mary Cushman Coyle. Her brother, David Cushman Coyle (1887–1969) wrote popular books on economics and public policy, and was appointed to Franklin D. Roosevelt's "Brain Trust".
Alessandro Giuseppe Antonio Anastasio Volta (UK: / ˈ v ɒ l t ə /, US: / ˈ v oʊ l t ə /; Italian: [alesˈsandro ˈvɔlta]; 18 February 1745 – 5 March 1827) was an Italian chemist and physicist who was a pioneer of electricity and power, [1] [2] [3] and is credited as the inventor of the electric battery and the discoverer of methane.
He invented a method that, he said, could treat virtually all forms of cancer, [1] with no side effects, and without the need for surgery or medication. [ 1 ] [ 2 ] [ 3 ] [ needs update ] He also demonstrated a device that generated flammable hydrogen-containing gas from salt-water-solution by the use of radiowaves.
In 1800, Volta invented the first true battery, storing and releasing a charge through a chemical reaction instead of physically, which came to be known as the voltaic pile. The voltaic pile consisted of pairs of copper and zinc discs piled on top of each other, separated by a layer of cloth or cardboard soaked in brine (i.e., the electrolyte ).
In 1842, Grove developed the first fuel cell (which he called the gas voltaic battery), which produced electrical energy by combining hydrogen and oxygen, and described it using his correlation theory. [3] In developing the cell and showing that steam could be disassociated into oxygen and hydrogen, and the process reversed, he was the first ...
A 1919 illustration of a Leclanché cell. The Leclanché cell is a battery invented and patented by the French scientist Georges Leclanché in 1866. [1] [2] [3] The battery contained a conducting solution (electrolyte) of ammonium chloride, a cathode (positive terminal) of carbon, a depolarizer of manganese dioxide (oxidizer), and an anode (negative terminal) of zinc (reductant).