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Caesium Atomic Clock, 1955.

Caesium Atomic Clock, 1955.

1955

Automatic Computing Engine (ACE) pilot model, 1949

Automatic Computing Engine (ACE) pilot model, 1949

1949

Mercury delay line from the ACE computer, NPL

Mercury delay line from the ACE computer, NPL

1958-1967

Punch cards in tray for Pilot ACE computer

Punch cards in tray for Pilot ACE computer

circa 1950

Experimental screw diameter measuring machine

Experimental screw diameter measuring machine

1915

Wind tunnel calibration balance

Wind tunnel calibration balance

1940-1960

Prototype HCN Infra-Red Laser

Prototype HCN Infra-Red Laser

1970-1972

National Physical Laboratory at Teddington

National Physical Laboratory at Teddington

1932-05-06

Polyethylene terephthalate filaments spool, 1943-1944

Polyethylene terephthalate filaments spool, 1943-1944

1943-1944

Reversing gear for petrol launch engines

Reversing gear for petrol launch engines

1905-1911

National Physical Laboratory at Teddington

National Physical Laboratory at Teddington

1932-05-06

Concave diffraction grating on speculum metal

Concave diffraction grating on speculum metal

1926, May

Spools of polyethylene terephthalate filaments, 1943-1944.

Spools of polyethylene terephthalate filaments, 1943-1944.

1943-1944

Dial gauge testing machine

Dial gauge testing machine

1954

Polyethylene terephthalate filaments spool, 1943-1944

Polyethylene terephthalate filaments spool, 1943-1944

1943-1944

National Physical Laboratory at Teddington

National Physical Laboratory at Teddington

1932-05-06

Polyethylene terephthalate filaments spool, 1943-1944

Polyethylene terephthalate filaments spool, 1943-1944

1943-1944

Transmission diffraction grating

Transmission diffraction grating

1950-1958

A fiducial head used on the bench type measuring machine

A fiducial head used on the bench type measuring machine

1924

A Bench micrometer-head from a bench type measuring machine

A Bench micrometer-head from a bench type measuring machine

1924

Experimental measuring machine designed by E.M. Eden

Experimental measuring machine designed by E.M. Eden

1918

Control desk, for Automatic Computing Engine (ACE) pilot model, made at the National Physical Laboratory, Teddington, London, England, 1949. The construction of the (ACE) pilot model was based on designs by Alan Turing.

Control desk, for Automatic Computing Engine (ACE) pilot model, 1949

1949

Sir Patrick Moore's first surviving large telescope, nicknamed 'Oscar'. 12 1/2 inch reflecting telescope by H.N. Irving and Son, Teddington, London. Mirror by Wildey, London. Tripod not original. Bought c. 1948 and used at East Grinstead, Armagh and Surrey. Used for lunar observations, including those used by Moore to map libration zones. Acquired alongside the Archive of Sir Patrick Moore.

'Oscar', Sir Patrick Moore's first surviving large telescope

circa 1948

A collection of papers relating to the Board of Trade Standards Department and its successor departments. It consists of indenture certificates issued to local authorities for the examination, testing, and calibration of local standards of weight, length and volume; early 20th century weights and measures legislation and other documents from around the world; and photographs of equipment and people associated with the department.

Weights and Measures Archive

20th Century

Prototype mekometer designed by National Physical Laboratory, 1965-1968

Prototype mekometer, 1965-1968

1965-1968

Eden's Screw diameter measuring machine; floating head type, 2" capacity with a pair of 14 t.p.i. needles.

Eden's screw diameter measuring machine, 1916

1916

Thermal conductivity apparatus for thin discs of insulating materials designed and built at the National Physical Laboratory, England, 1923.

Thermal conductivity apparatus

1901-1927

2 Bench micrometer-heads from a bench type measuring machine,made 1924, by the N.P.L.

2 Bench micrometer-heads from a bench type measuring machine

1924

Threlfall quartz-thread gravity balance for exploration geophysics, made by Richard Threlfall and James Pollock, Australia, 1889 - 1899, later tested and modified at the National Physical Laboratory, Teddington, London, UK, 1923.

Threlfall quartz-thread gravity balance

1899

Wind Tunnel Calibration Balance

Wind Tunnel Calibration Balance

1940-1960

Automatic scale measuring laser interferometer (length comparator)

Automatic scale measuring laser interferometer (length comparator)

1964-1965

Two micrometer surface testers used together and with electric bell system to measure divergence from flatness of large plane surfaces; designed and used by Dr. P.E. Shaw for experimental work in 1911.

Micrometer surface testers

1911

Demountable gas x-ray tube for crystallography, by the National Physical Laboratory, Teddington, England, 1912-1930.

Demountable gas x-ray tube for crystallography

1912-1930

Taper Thread Gauge checking machine, 1934, for the measurement of the thread pitch.

Taper Thread Gauge checking machine

circa 1934

Parts of the automatic scale measuring laser interferometer (length comparator)

Parts for Automatic Scale Measuring Laser Interferometer

1964-1965

Set of 45 chasses and valves and one "Proud Stander", for Automatic Computing Engine (ACE) pilot model, by National Physical Laboratory, Teddington, England, 1950

Set of 45 chasses and valves and one 'Proud Stander', for Automatic Computing Engine (ACE) pilot model, 1950

1950

Long mercury delay line, for Automatic Computing Engine (ACE) pilot model, by National Physical Laboratory, Teddington, England, 1949. The construction of the (ACE) pilot model was based on designs by Alan Turing.

Long mercury delay line, for Automatic Computing Engine (ACE) pilot model, 1949

1949

3 blue print drawings associated with the projection screw thread measuring apparatus.

3 blue print drawings associated with the projection screw thread measuring apparatus

1917

Parts of the automatic scale measuring laser interferometer (length comparator)

Parts for Automatic Scale Measuring Laser Interferometer

1964-1965

Short mercury delay line, for Automatic Computing Engine (ACE) pilot model, by National Physical Laboratory, Teddington, England, 1949. The construction of the (ACE) pilot model was based on designs by Alan Turing.

Short mercury delay line, for Automatic Computing Engine (ACE) pilot model, 1949

1949

Tide records for Brisbane from 30.12.1907 to 1.1.1909.

Tide records for Brisbane from 30.12.1907 to 1.1.1909

c.1907