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December 6, 2006

Cleaning standard weights

Via the magnificent Ben Craven: the officially-mandated cleaning regime for international standard platinum-iridium kilogram prototypes (2Mb PDF download). You have to read this in order to appreciate the subtlety of the process, which begins by scrubbing the thing with a finger wrapped in a solvent-soaked chamois. Genius.

(file alongside 'ISO standard for making tea,' which was, I think, the story that got Kevin Marks reading The Daily Grind. Gosh, fame. etc. Oh, and while you're at it, take a look at Ben's magnificent never-turning gear train. Double genius.)


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This page contains a single entry by Jonathan published on December 6, 2006 10:10 AM.

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