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Portable thermometer screen

1925

Wind tunnel calibration balance

1940-1960

Assmann psychrometer

1922

Experimental screw diameter measuring machine

1915

Punch cards in tray for Pilot ACE computer

circa 1950

Concave diffraction grating on speculum metal

1926, May

Dial gauge testing machine

1954

Mercury delay line from the ACE computer, NPL

1958-1967

Transmission diffraction grating

1950-1958

Automatic Computing Engine (ACE) pilot model, 1949

1949

Slow-speed ACE simulator, 1950

1950
Wind Tunnel Calibration Balance

Wind Tunnel Calibration Balance

1940-1960
Gas filled pyrometer standard No. 285, calibrated at the National Physical Laboratory (a specially designed lamp with a metal filament, in a wooden case, probable date 1951.

Gas filled pyrometer standard No. 285

circa 1951
The prototype commercial HCN gas laser unit consisting of a discharge tube and thermally stabilised optical system capable of giving 1 mW output in the far infra-red range, 1971.

prototype HCN infra-red laser

1970-1972
Prototype mekometer designed by National Physical Laboratory, 1965-1968

Prototype mekometer, 1965-1968

1965-1968
Taper Thread Gauge checking machine, 1934, for the measurement of the thread pitch.

Taper Thread Gauge checking machine

circa 1934
Automatic scale measuring laser interferometer (length comparator)

Automatic scale measuring laser interferometer (length comparator)

1964-1965
Screw pitch measuring machine 3"x7". Designed by N.P.L. and made by G. Cussons Ltd in 1942. Complete with R7/8" standard thread test piece

Screw pitch measuring machine 3"x7"

1942
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
Moving coil galvanometer, made by National Physical Laboratory, England, 1932.

Moving coil galvanometer

1932
[Printed material, 1924-1957, re history and work of the National Physical Laboratory, Teddington. 9 booklets]

Printed material

1924-1957
25 Kilobar piston cylinder apparatus designed and constructed at the National Physical Laboratory mid 1960's

25 Kilobar piston cylinder apparatus

1963-1967
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
Thermal conductivity apparatus for thin discs of insulating materials designed and built at the National Physical Laboratory, England, 1923.

Thermal conductivity apparatus

1901-1927
Cold store dew-point hygrometer, 1921.

Cold store dew-point hygrometer

1921
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
N.P.L. design horizontal projector by Precision Tool and Instrument Co. Ltd., c. 1945, including 4 1/2in. x 2 1/4in. lens, work stage, 2 shadow protractors 24 thread form templates, wall screen, floor rails, focussing pulleys, 2 cards

N.P.L. design horizontal projector by Precision Tool and Instrument Co. Ltd.

1945