NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY
Testing thermometers. Several thermometers are being analysed simultaneously using laboratory testing equipment. The thermometers (centre) are arranged in a circular cage and lowered into an electrically heated water bath. The readings from these are then compared with the standard laboratory thermometer. Photographed at the National Physical Laboratory, Teddington, UK, in 1918.
Model release not required. Property release not required.