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
Automatic scale measuring laser interferometer (length comparator) Automatic scale measuring laser interferometer (length comparator) 1964-1965
Prototype mekometer designed by National Physical Laboratory, 1965-1968 Prototype mekometer, 1965-1968 1965-1968
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
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
Taper Thread Gauge checking machine, 1934, for the measurement of the thread pitch. Taper Thread Gauge checking machine circa 1934
Moving coil galvanometer, made by National Physical Laboratory, England, 1932. Moving coil galvanometer 1932
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
[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
Thermal conductivity apparatus for thin discs of insulating materials designed and built at the National Physical Laboratory, England, 1923. Thermal conductivity apparatus 1901-1927
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
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
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