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<div>The National Measurement Institute’s (NMI) 550 kiloNewton (kN) force machine is a three-storey tall machine, made up of 56 tonnes of weights, installed at the NMI’s Lindfield laboratory in Sydney, NSW. It is Australia’s primary force standard and the highly precise forces it generates are used to provide a calibration service for force sensors and for customised testing. Calibrations performed with this machine underpin a wide range of critical measurements, ranging from the mass and centre of gravity of major airlines’ aircraft, to the strength of thousands of concrete samples tested daily around Australia.</div><div> Gravity measurements were requested by National Measurement Institute (NMI) to provide an accurate knowledge of the acceleration due to gravity, which is critical to determining the forces generated by the machine. Measurements were recorded using repeated loop measurements at the top and base of the machine, with measurements tied to the existing gravity benchmark “200498.9905” located in the barometry laboratory (room C269) which was also used to provide a measure of instrument drift. Measurements were performed over the course of one day on 23rd May 2024 using a Scintrex CG-5 relative gravimeter (Serial Number 40818).</div>

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