Captain Hatton B. Rogers, food technologist, Quartermaster Corps Mobile Chemical and Bacteriological Laboratory

View of Captain Hatton B. Rogers, food technologist, at the Mobile Chemical and Bacteriological Laboratory of the Quartermaster Corps. Hatton places petri dish containing bacteriological specimen inside incubator. Plaque on incubator reads: "Mobile Chemical and Bacteriological Laboratory manufactured by Cleaver-Brooks Company, Milwaukee, Wisconsin." Printed on front: "Signal Corps, U.S. Army." Typed on back: "Captain Hatton B. Rogers, food technologist, places plate containing bacteriological specimen from processed food in electrically controlled incubator to determine bacteriological count. These plates are kept in incubator twenty-four to forty-eight hours at temperatures from 98 degrees. Below is freezing compartment used to store frozen foods and certain chemicals which keep better at low termperatures. At right is a vacuum oven which determines moisture content, in dehydrated foods." Stamped on back: "Signal Corps photo, please credit. Released for publication by Bureau of Public Relations, War Department."