[time-nuts] HP 5065A rubidium lifetime

[Neville Michie]

Re Phosphoric acid,
My supply is an old bottle of Phosphorous pentoxide (P2O5) that was  
used as a desiccant in a vacuum system.
It has hydrated from atmospheric humidity to form the "oily"  
phosphoric acid, (H2P2O6 which in solution dissociates to H3PO4- and H 
+),
and  can be diluted in small quantities to any concentration. I have  
used about one gram in the last 10 years.
It is sold as a rust converter, but as such may have other additives  
like PVA glue.
Legend has it you can solder stainless steel with Coca Cola, but the  
sugar and caramel make that unlikely.
A compounding pharmacy may be able to sell you some.
I hope that that helps,
Cheers, Neville Michie




On 22/03/2010, at 7:43 AM, paul swed wrote:

> Were do you obtain a small amount of phosphoric acid????
> Also when I looked it up they said it was H3PO4. Doesn't sound like  
> the
> same.
> Is there a common use for it?
>
> On Sun, Mar 21, 2010 at 1:58 PM, randy hunt  
> <randy_hunt960 at yahoo.com> wrote:
>
>> Try measuring a known length of the resistance wire, say 6 inches  
>> and then
>> double. . .
>>
>> Randy
>>
>> Hi
>>
>> Next step would be to figure out what a reasonable ohms / foot number
>> is.
>>
>> Bob
>>
>>
>> On Mar 21, 2010, at 12:41 AM, Chuck Harris
>> wrote:
>>
>>> HP just wound two parallel wires around the cylinder.  They
>> did not
>>> twist.  The wires at the entrance end of the solenoid went to
>> the
>>> electronics, the wires at the exit end of the solenoid were
>> shorted
>>> together... I think they used a crimp for the short.
>>>
>>
>>> -Chuck Harris
>>>
>>> J. L. Trantham wrote:
>>>> Do you
>> make a 'twisted pair' and then wind that or just wind two parallel
>>>>
>> wires around the cylinder?
>>>> Joe
>>>
>>>
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