NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY
Testing thermometers. Laboratory technicians analysing thermometers using testing equipment. The thermometers are lowered into an electrically heated water bath (not seen). The readings from these are then compared with the standard laboratory thermometer. Photographed at the National Physical Laboratory, Teddington, UK, in the early 1920s.
Model release not available. Property release not required.