The explosive ones, are you referring to? ;)
El 20/09/2011 20:52, Tijd Dingen escribió:
Depends what you mean by "much higher". Helium has almost 6 times higher
thermal conductivity. Hydrogen is higher, but has certain drawbacks. ;-)
regards,
Fred
________________________________
From: Dick Moore<[email protected]>
To: [email protected]
Sent: Tuesday, September 20, 2011 8:39 PM
Subject: Re: [time-nuts] Making a 10811 better
Is there a relatively inert gas that has much higher thermal conductivity than
air? Then a flask makes sense and is not the size of the basement...
Dick Moore
On Sep 20, 2011, at 5:00 AM, [email protected] wrote:
------------------------------
Message: 2
Date: Mon, 19 Sep 2011 18:21:30 -0700
From: ed breya<[email protected]>
To: [email protected]
Subject: [time-nuts] Making a HP 10811 better
Message-ID:<[email protected]>
Content-Type: text/plain; charset="us-ascii"; format=flowed
One last thing regarding oil-filling. My previous comment was made
picturing oil inside the oscillator block only - not outside, or
between the outer parts - if there is a resistance wire heater (I
think it's heated with Qs only on the 10811) it is held together with
various tapes and adhesives that could soften or dissolve. Also, the
insulation would not insulate very well of saturated with oil, and
could possibly soften or break down somehow. I would not recommend
dunking the whole thing in a vat of oil.
And one final, final note: If oil is somehow effectively contained in
the oscillator block, then a void (bubble) of some sort, or an
expansion facility or vent would be needed to relieve the pressure
changes during warmup. Otherwise, when started up, the expanding oil
would have to either leak out, or deform (or damage) something. This
would be equivalent to dramatically increasing barometric pressure,
and certainly effect the oscillator frequency.
Ed
------------------------------
Message: 3
Date: Mon, 19 Sep 2011 23:20:28 -0600 (MDT)
From: "Don Latham"<[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Subject: Re: [time-nuts] Making a HP 10811 better
Message-ID:
<[email protected]>
Content-Type: text/plain;charset=iso-8859-1
Ah well. Just a thought. I was thinking of simply dumping the whole
thing into a picnic jug full of baby oil :-)
Sorta scatterbrained, but I have seen mentioned on the list a basement
sized steel block ...
Don
ed breya
One last thing regarding oil-filling. My previous comment was made
picturing oil inside the oscillator block only - not outside, or
between the outer parts - if there is a resistance wire heater (I
think it's heated with Qs only on the 10811) it is held together with
various tapes and adhesives that could soften or dissolve. Also, the
insulation would not insulate very well of saturated with oil, and
could possibly soften or break down somehow. I would not recommend
dunking the whole thing in a vat of oil.
And one final, final note: If oil is somehow effectively contained in
the oscillator block, then a void (bubble) of some sort, or an
expansion facility or vent would be needed to relieve the pressure
changes during warmup. Otherwise, when started up, the expanding oil
would have to either leak out, or deform (or damage) something. This
would be equivalent to dramatically increasing barometric pressure,
and certainly effect the oscillator frequency.
Ed
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--
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
R. Bacon
"If you don't know what it is, don't poke it."
Ghost in the Shell
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com
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