It’s official: NIST’s 4.45-million newton (equivalent to one million pounds-force) deadweight machine – the largest in the world – is back in one piece after a colossal 16-month effort to overhaul the system for the first time in 50 years.
The year-and-a-half-long saga involved dismantling, cleaning, restoring, and recalibrating about half of the stainless steel discs in the three-story stack of weights.
Source: http://www.nist.gov/pml/div684/grp07/nist-million-pound-weight-stack-restoration-is-complete.cfm.
