[time-nuts] Thunderbolt stability and ambient temperature

[Lux, James P]

> 
> 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