[time-nuts] Thunderbolt stability and ambient temperature

Bob Camp lists at cq.nu
Wed Jun 10 20:24:35 EDT 2009


Hi

Just for reference:

It takes about 700 pounds of steel shot to fill up the region between  
a 30 gallon steel drum and a 55 gallon steel drum. You can get roughly  
2" of foam in between the outside of the 55 gallon steel drum and a  
110 gallon drum. A 2x4 wall around the 110 gallon drum can be useful  
for taking care of drafts.

Steel may not be perfect, but in shot form - it's cheap.

Bob


On Jun 10, 2009, at 8:19 PM, J. Forster wrote:

> Take a look here:
>
> http://en.wikipedia.org/wiki/Thermal_diffusivity
>
> -John
>
> ===========
>
>> The thermal conductivity of cast iron is relatively poor for a metal.
>> Water has even lower thermal conductivity however this can be  
>> overcome
>> by stirring.
>>
>> Bruce
>
>
>
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