Richard Zitto of Columbiana displays a classroom demonstration Micrometer, part …

Photo by Robert K. Yosay | published: July 19, 2010

Richard Zitto of Columbiana displays a classroom demonstration Micrometer, part of his large collection of teaching devices for physics classes. The former Boardman High School and Youngstown State University instructor is giving the Smithsonian Institution 171 pieces of his collection.