[time-nuts] Thunderbolt stability and ambient temperature

Lux, James P james.p.lux at jpl.nasa.gov
Wed Jun 10 17:30:08 EDT 2009

> I read somewhere the suggestion to take the cast iron block 
> from an old automobile engine and put it in a heavy insulated 
> wooden cabinet: ~250 Kg of iron in an insulated box.  Cracked 
> blocks are useless in an engine, and so are available in 
> junkyards quite cheap.
> Joe Gwinn

At $0.10-0.20/lb scrap value, cheap means $50-100

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