Martha Cowles Chase & Alfred Day Hershey                               

                  Blendor Photo: Courtesy of , Sue Lauter, Cold Spring Harbor
                      to The Scientist Volume 18 | Issue 7 | 14 | Apr. 12, 2004

Department of Genetics, Carnegie Institution of Washington at Cold Spring Harbor, Long Island, New York.

Martha Chase was Dr. Hershey's lab technician in 1952. They tagged the protein coat of phages with 35S and the DNA core with 32P.  Using a Waring blendor (photo) causing the the bacteriophage viruses to break off from the outside of bacteria with the tagged protein going to supernatant and labeled DNA being lodged inside viral sediment layer confirming that DNA was the genetic information of cells.
animation of their bacteriophage experiment