Robert Hallowell Richards

Robert Hallowell Richards (August 26, 1844 – March 27, 1945)[1] was an American mining engineer, metallurgist, and educator, born at Gardiner, Maine.

Richards invented a jet aspirator for chemical and physical laboratories and a prism for stadia surveying.

He determined the curves of material settling in water, thereby establishing the fundamental principles of sorting ore by means of jigs and other machines.

He invented separators for Lake Superior copper, Virginia iron, and three for ores of the Western United States.

He was author of more than 100 monographs and articles, but his most notable work is a monumental treatise, Ore Dressing (four volumes, 1903–09).