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The international prototype of the kilogram and its six official copies
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The international prototype
The international prototype of the kilogram and its six official copies
Stainless-steel one-kilogram standard in its travelling case for a key comparison
Steam cleaning of a 1 kg prototype before a mass comparison
Mettler HK1000MC balance, housed in an air-tight enclosure, used for calibrations
Finding the centre of gravity of a mass standard
Magnetic properties
Heterodyne refractometer used to monitor air density variations
Phase-modulated ellipsometer used to study surface effects on mass standards
Flexure-strip balance (FB-2) designed and constructed at the BIPM
The beam and servo-mechanism of the FB-2 balance
Novel torsion balance for the determination of the Newtonian constant of gravitation G
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International prototype of the kilogram
Verifications
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International prototype of the kilogram
Verifications
     
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