NATIONAL PHYSICAL LABORATORY: SCIENCE AND TECHNOLOGY IN WARTIME, TEDDINGTON, MIDDLESEX, ENGLAND, UK, 1944
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A general view of the High Tension Laboratory in the Electricity Division of the National Physical Laboratory. The laboratory is equipped with apparatus to develop very high voltage in order to study the properties of insulators and high tension cables. Clearly visible are sphere gaps used for high-voltage measurements, and the generator which is used to produce surge voltages of 2,000,000 volts.