Hi
Platinum RTD's are a pretty good bet for -80C, they hold up well down there.
For calibration, ammonia and acetylene both have triple points in the vicinity.
I'd probably try ammonia first, but not for any good reason. Triple point cells
aren't all that hard to make. Never tried it with
Il 2013-01-26 14:58 Bob Camp ha scritto:
Hi
Platinum RTD's are a pretty good bet for -80C, they hold up well down
there. For calibration, ammonia and acetylene both have triple points
in the vicinity. I'd probably try ammonia first, but not for any good
Doesn't acetylene have a bad habit of
For microscopes and all related topics, the Yahoo Microscope Group is very
knowledgeable. It has over 3500 members now.
-John
=
This is by definition Off Topic
I'm looking for a forum where people are about as technically
competent as here but where an amateur scientist
Hi Chris,
Try pinging the folks on this forum phy...@antennex.com which is oriented
towards Theoretical Physics, or email Kirk T McDonald at Princeton directly
and see if he can recommend one for you.
Russ
K0WFS
--
Message: 2
Date: Fri, 25 Jan 2013 21:32:58 -0800
From: Chris
Hi
Sounds like a good reason to avoid it.
Bob
On Jan 26, 2013, at 10:28 AM, Fabio Eboli fabi...@quipo.it wrote:
Il 2013-01-26 14:58 Bob Camp ha scritto:
Hi
Platinum RTD's are a pretty good bet for -80C, they hold up well down
there. For calibration, ammonia and acetylene both have triple
Trying to play with liquid acetylene is like juggling operating chainsaws.
-John
Il 2013-01-26 14:58 Bob Camp ha scritto:
Hi
Platinum RTD's are a pretty good bet for -80C, they hold up well down
there. For calibration, ammonia and acetylene both have triple points
in the
If the intent is surface mount work, get an old BL Stereozoom 3. I'd suggest
getting one with any attached illuminator, even a broken one, since the fitting
to hold the illuminator is about $30. Later model stereozooms had plastic parts
in the focus mechanism. If you need more magnification,
I did a Google search and came across sciencenuts.org, but content was
limited
If you have no success, maybe science-nuts could be created. There would be at
least two of us joining.
- Original Message -
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise
Maybe wrong search words;
There may be pearls in here:
http://www.goedonline.com/101-websites-for-science-teachers
Don
DARRELL ROBINSON
I did a Google search and came across sciencenuts.org, but content was
limited
If you have no success, maybe science-nuts could be created. There
would
Or perhaps:
http://www.scienceforums.net/forum/78-amateur-science/
Don
Don Latham
Maybe wrong search words;
There may be pearls in here:
http://www.goedonline.com/101-websites-for-science-teachers
Don
DARRELL ROBINSON
I did a Google search and came across sciencenuts.org, but content was
Message: 4
Date: Sat, 26 Jan 2013 16:28:19 +0100
From: Fabio Eboli fabi...@quipo.it
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] OT, looking for a good science forum
Message-ID: 5ef3f142b075fcab38182666a4e50...@quipo.it
On 1/26/2013 1:29 PM, Paul Amaranth wrote:
Message: 4
Date: Sat, 26 Jan 2013 16:28:19 +0100
From: Fabio Eboli fabi...@quipo.it
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] OT, looking for a good science forum
Message-ID:
Hi
If the intent is to come up with a triple point cell to calibrate your
thermometer, acetone's triple point (at 178.5K) is a bit low. I still think I'd
go with ammonia.
Bob
On Jan 26, 2013, at 2:51 PM, Graham / KE9H time...@austin.rr.com wrote:
On 1/26/2013 1:29 PM, Paul Amaranth wrote:
You might try the Society of Amateur Scientists at:
http://www.soamsci.org/index.html
There is also the Science Madness BBS, although they lean heavily toward
chemistry:
http://www.sciencemadness.org/talk/index.php
73,
Bob Weiss N2IXK
___
You can't be serious. Ammonia gas or liquid is dangerous.
You can buy calibrated RTDs or rent a quartz thermometer and stay alive.
YMMV,
-John
===
Hi
If the intent is to come up with a triple point cell to calibrate your
thermometer, acetone's triple point (at 178.5K) is a
On Sat, Jan 26, 2013 at 10:00 AM, li...@lazygranch.com wrote:
If the intent is surface mount work, get an old BL Stereozoom 3. I'd suggest
getting one with any attached illuminator, even a broken one, since the
fitting to hold the illuminator is about $30. Later model stereozooms had
The microscope group can help with reccomendations. 1000x is really
pushing it, because of 'empty magnification'.
Best,
-John
==
On Sat, Jan 26, 2013 at 10:00 AM, li...@lazygranch.com wrote:
If the intent is surface mount work, get an old BL Stereozoom 3. I'd
suggest
Hi
Yes, indeed you can buy or rent a calibrated RTD. You might be able to rent a
quartz thermometer. The HP version (2804) has been history for quite a while.
In both cases they come with a cute little disclaimer on the accuracy that more
or less says:
We can't be sure that this stays
On Sat, Jan 26, 2013 at 1:46 PM, J. Forster j...@quikus.com wrote:
The microscope group can help with reccomendations. 1000x is really
pushing it, because of 'empty magnification'.
1000x is the standard. Almost every microscope in a biology lab
will have a 100x oil immersion objective and a
http://edl-inc.com/datasheetPDFgallery.php
For example.
Unless you are doing fundamental physics research, are you sure you need a
cryo temperature standard?
-John
==
Hi
Yes, indeed you can buy or rent a calibrated RTD. You might be able to
rent a quartz thermometer. The HP
Hi
I was thinking more in terms of:
http://us.flukecal.com/products/temperature-calibration/probessensors/secondary-standard-prts/56265628-secondary-sprt-prt-t
It all depends on what you are trying to do. Since I didn't make the original
request, and no tolerance was stated, it's all
On 26 January 2013 18:31, DARRELL ROBINSON darr...@shaw.ca wrote:
I did a Google search and came across sciencenuts.org, but content was
limited
If you have no success, maybe science-nuts could be created. There would be
at least two of us joining.
Make that three.
Dave
The stereo boom mount scopes from amscope are priced right. The one I have
seems well made and works great for surface mount work down to 0201. Some of
the finish details are a bit off (generic metal adjustment handles) but it was
a new, complete, guaranteed working scope so I don't have any
I like the idea of a amateur microscopy nuts reflector.
After a warm day, my bees took their cleansing flights and I collected
some of their poop to look for parasites.
Did not find anything moving at 500x , like tracheal mites or their
parts, but I did find a lot of undigested pollen.
I
On 1/25/2013 1:43 AM, David J Taylor wrote:
From: Sarah White
[complex instructions snipped]
--Sarah
P.S. sorry to double-post like this.
===
Sara,
It's far simpler to go into the Device Manger and disable the spurious
device, as described
The Yahoo Microscope Group already exists with over 3700 members world
wide, which forms a huge knowlege base, from biology to microelectronics.
http://tech.groups.yahoo.com/group/Microscope/
Why re-invent the wheel?
-John
==
I like the idea of a amateur microscopy nuts reflector.
http://www.gpsmap.net/GarminHints.html#GPSR_ComputerMouse
David -- that particular solution does not work in many cases.
Shortened URL: http://goo.gl/xFcSc
Sarah -- that solution also doesn't work in many cases. Read the entire 3 pages
of frustrated comments that follow the so-called
Thanks for the pointer. I am checking it out now. Stan
On 1/26/2013 8:59 PM, J. Forster wrote:
The Yahoo Microscope Group already exists with over 3700 members world
wide, which forms a huge knowlege base, from biology to microelectronics.
http://tech.groups.yahoo.com/group/Microscope/
Why
Eh, I'd spend the extra $200 and get a BL unless you don't expect to use it
much. At around $300, you would get a Stereozoom 3, heavy table and long arm.
The Stereozoom dates back to the days they built magnetic RAM. It is designed
for all day use. The working distance is kind of important if
Try a AO PhaseStar phase contrast microscope they are relatively cheap on eBay
and they should be more than adequate for beekeeping. The phase contrast
feature allows you to see celluar details without staining in most cases
Most of them have fittings for camera tubes so photomicrography is
Liquid acetone requires special handling and pressurized cells to keep it from
explosively disassociating. Ammonia also requires pressure vessels and in
pure form is incredibly corrosive
So unless you are trained in these techniques just don't even think about doing
this
Sent from my iPhone
http://www.gpsmap.net/GarminHints.html#GPSR_ComputerMouse
David -- that particular solution does not work in many cases.
Shortened URL: http://goo.gl/xFcSc
Sarah -- that solution also doesn't work in many cases. Read the entire 3
pages of frustrated comments that follow the so-called
-Original Message-
From: Sarah White
[]
Whatever works for you though I guess. I was just explaining the
officially supported method *shrugs*
=
It seems from Tom's comments that the various fixes don't work for everyone.
I count myself
Scott wrote:
Liquid acetone requires special handling and pressurized cells to
keep it from explosively disassociating.
Did you mean liquid acetylene? Liquid acetone is sold in nearly
every hardware and drug store in the US, and is one of the usual
solvents into which acetylene is
On Sat, Jan 26, 2013 at 2:12 PM, J. Forster j...@quikus.com wrote:
Unless you are doing fundamental physics research, are you sure you need a
cryo temperature standard?
You are right. What I asked I should have said that 1% accuracy would
be good enough.I'm pretty sure now that I can get
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