CHEMICAL HERITAGE FOUNDATION / SCIENCE PHOTO LIBRARY CHEMICAL HERITAGE FOUNDATION / SCIENCE PHOTO LIBRARY
This image may not be used to state or imply the endorsement by the Science History Institute of any product, service or activity, or to concur with an opinion or confirm the accuracy of any text appearing alongside or in logical association with the image. Editorial use only.
John Van Nostrand Dorr (1872-1962), US chemist. Dorr worked in chemical engineering, developing machines (classifiers) to separate solid particles suspended in liquids (used in sewage treatment and water purification). His awards included the John Scott Medal (1916) from the City of Philadelphia and the Franklin Institute and the Perkin Medal (1941) of the Society of Chemical Industry. In the 1950s, Dorr made a key contribution to road safety by proposing the painting of white lines on the outside shoulder of motorways and roads. This dramatically reduced accident rates. Photograph by Alman and Company photographic studio, New York, USA.
Model release not available. Property release not required.