Based at Teddington, developed and maintained the primary national measurement standards.
1899 The campaign for a National Physical Laboratory was successful; NPL was created under the control of the Royal Society, supported financially by a Treasury grant in aid. Richard Tetley Glazebrook was appointed director
Initially NPL was to be based at Kew Observatory but public opposition to an extension of that site led to a search for an alternative.
1900 Selection of Bushy House, Bushy Park in Teddington, as the site for NPL.
1902 Formally opened on 19 March by the Prince of Wales who said: "I believe that in the National Physical Laboratory we have the first instance of the State taking part in scientific research. The object of the scheme is, I understand, to bring scientific knowledge to bear practically upon our everyday industrial and commercial life, to break down the barrier between theory and practice, to effect a union between science and commerce...... Does it not show in a very practical way that the nation is beginning to realise that if its commercial supremacy is to be maintained, greater facilities must be given for furthering the application of science to commerce and industry?"
1907 NPL began testing taximeters - at its peak about 10,000 were tested each year.
1908 Early research on wind forces on structures such as bridges and roofs was applied to the study of flight leading to rapid advances in the efficiency and safety of the aeroplane.
1910 The first ship tank was completed, funded by Alfred Yarrow; it held 5000 tonnes of water with a centre depth of 3.75 m.
1911 Start of research into vehicles and transport, including road surface testing, impact of motor vehicles, loudness of car horns, and the effect of skidding. NPL developed a machine for testing the endurance and wear of road surfaces.
WWI The source of financial support was changed to the Department of Scientific and Industrial Research (DSIR).
1919 Pioneer of wind tunnel testing - a wind tunnel was built in 1919.
1920 Routine testing of engineering materials covered many properties
1923 Worked on improving the ventilation in the chamber of the House of Commons.
1933 Vehicle and transport research moved out of NPL
1933 Staff working on radio research who were directly controlled by DSIR (employed principally at Teddington and Slough) were united administratively to form a new Radio Department (later Division) of the National Physical Laboratory.
1935 Robert Watson-Watt produced his famous paper which led to the development of radar; Watson-Watt was the Superintendent of the new Radio Department at NPL.
1946 Development of the first Automatic Computing Engine (ACE) began. Alan Turing was part of a group formed for the design, construction and use of a large automatic computing engine. During his time at NPL, Turing planned ACE and carried out a great deal of pioneering work in the design of subroutines.
1946 the Radio Research Board drew up a research programme and recommended that a new and separate radio research station be created to carry it out, and that a director of radio research should be appointed. It was decided to create a separate Radio Research Organisation to absorb and develop the work of the National Physical Laboratory's Radio Division, and the superintendent of the division was appointed director of radio research.
1955 NPL developed an accurate caesium atomic clock, which led to the internationally agreed definition of the second being based on atomic time.
1970s Developed "packet switching", a technique for transmitting long messages by splitting the data into parts and temporarily storing them at computer nodes - this is the basis of the internet.