NIST's Million-Pound Makeover

<div><div>NIST's Rick Seifarth discusses the 16-month overhaul of the Physical Measurement Laboratory's 4.45 meganewton (one million pounds-force) deadweight machine, the largest in the world. This featurette includes video and photos of the demolition of the machine's three-story weight stack; machine shop repairs of minor damage from 50 years of use; recalibration of the 50,000-pound stainless steel weights in the stack; and the final reassembly of the system with its refurbished weights. Credit: Jennifer Lauren Lee/NIST</div></div>