NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY
Testing taxi meters. Researchers assessing the reliability of taxi meters in calculating the correct fare. These taxi meters were first invented by the German Wilhelm Bruhn in 1891. They were mechanical devices that were mounted outside the cab above the driver's side front wheel. Photographed at the National Physical Laboratory, Teddington, UK, in the 1920s.
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