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Celebrating the Inner Cranky since 15:13 Yesterday
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Posted: 2/5/2012 11:49:02 AM EST
I've been looking for a good old-style mercury filled oral thermometer, but all I'm finding is Mercury Free or cheesy imports with reviews that mention them blowing up under hot tap water.

Any ideas where I can find a good one?
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Link Posted: 2/5/2012 11:53:43 AM EST
China
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Link Posted: 2/5/2012 11:54:10 AM EST
Don't think so. I never see them in the stores now.
:/
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Link Posted: 2/5/2012 11:57:29 AM EST
Isn't it odd how mercury became toxic after milleniums , what a fucked up society we habitate

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Link Posted: 2/5/2012 11:58:58 AM EST
Whats the appeal?


Posted Via AR15.Com Mobile
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Link Posted: 2/5/2012 12:00:17 PM EST
Originally Posted By Star_Scream:
Whats the appeal?


Posted Via AR15.Com Mobile


None for me, digital is a lot faster.
:/
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Link Posted: 2/5/2012 12:00:22 PM EST

Originally Posted By Star_Scream:
Whats the appeal?


Posted Via AR15.Com Mobile

No battery, no calibration. 100+ years of safe use.
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Link Posted: 2/5/2012 12:01:27 PM EST
what it the difference between an oral and anal thermometer?
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Link Posted: 2/5/2012 12:03:43 PM EST

Originally Posted By rustybelly:
Isn't it odd how mercury became toxic after milleniums , what a fucked up society we habitate


Originally Posted By Aimless:
Arfcom runs on hate and cheap steel cased ammo buddy.
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Link Posted: 2/5/2012 12:04:50 PM EST
Originally Posted By Keith_J:

Originally Posted By Star_Scream:
Whats the appeal?


Posted Via AR15.Com Mobile

No battery, no calibration. 100+ years of safe use.


I think they're more accurate too.
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Link Posted: 2/5/2012 12:07:32 PM EST

Originally Posted By Mr_Harry:
what it the difference between an oral and anal thermometer?

Bulb dimensions and calibration. Plus taste
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Link Posted: 2/5/2012 12:07:51 PM EST
Originally Posted By Mr_Harry:
what it the difference between an oral and anal thermometer?


IM TRG. All will be made clear.
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Link Posted: 2/5/2012 12:08:35 PM EST
Alcohol might be ok, but of the three or four digital type we have around the house, they all vary wildly even if used one after the other.
Computers may be twice as fast as they were in 1976, but your average voter is as drunk and stupid as ever.
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Link Posted: 2/5/2012 12:10:09 PM EST

Originally Posted By AirRaceFan:
Originally Posted By Keith_J:

Originally Posted By Star_Scream:
Whats the appeal?


Posted Via AR15.Com Mobile

No battery, no calibration. 100+ years of safe use.


I think they're more accurate too.

Yes. Electronic require a reference voltage, this may or may not remain constant as the unit ages or the battery discharges.


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Link Posted: 2/5/2012 12:19:08 PM EST
i remember playing with mercury when i was a kid - it was so cool, like liquid metal
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Link Posted: 2/5/2012 12:33:36 PM EST
Originally Posted By Mr_Harry:
what it the difference between an oral and anal thermometer?


It's a matter of the taste!

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Link Posted: 2/5/2012 12:48:13 PM EST
Originally Posted By rustybelly:
Isn't it odd how mercury became toxic after milleniums , what a fucked up society we habitate


Yeah, it's not like people in the Middle Ages didn't use it to cure all sorts of diseases, like syphilis.

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Link Posted: 2/5/2012 1:19:56 PM EST

Originally Posted By RJGatling:
Originally Posted By rustybelly:
Isn't it odd how mercury became toxic after milleniums , what a fucked up society we habitate


Yeah, it's not like people in the Middle Ages didn't use it to cure all sorts of diseases, like syphilis.

Many mercury compounds are effective antiseptics. Merthiolate, Mercurochrome...

The current mecurophobia is borne out of the EPA's goal of eliminating coal fired power plants.
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Link Posted: 2/5/2012 1:26:15 PM EST
My girl has three digitals here, and they all ready different temps - both between themselves and from attempt to attempt on the same one.

Colored alcohol could work, but I've never seen a mercury based thermometer get bubbles in the tube. If I have to, I'll go with Alcohol, but it is my second choice.
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Link Posted: 2/5/2012 1:46:35 PM EST
You ought to see the mercury spill clean up kits we have at the hospital. If one of the old school blood pressure cuffs breaks, the liquid mercury is treated as if it's fucking uranium-laced anthrax.


And yet, years ago kids would do this for fun:

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Link Posted: 2/5/2012 1:49:13 PM EST

Originally Posted By Justa_TXguy:
You ought to see the mercury spill clean up kits we have at the hospital. If one of the old school blood pressure cuffs breaks, the liquid mercury is treated as if it's fucking uranium-laced anthrax.


And yet, years ago kids would do this for fun:

http://www.learnnc.org/lp/media/uploads/2009/05/mercury.jpg

Hospitals and clinics are paying BIG bucks to dispose of them. Yet the mercury contained is worth about $100.
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Link Posted: 2/5/2012 1:52:20 PM EST
Originally Posted By Keith_J:

Originally Posted By Justa_TXguy:
You ought to see the mercury spill clean up kits we have at the hospital. If one of the old school blood pressure cuffs breaks, the liquid mercury is treated as if it's fucking uranium-laced anthrax.


And yet, years ago kids would do this for fun:

http://www.learnnc.org/lp/media/uploads/2009/05/mercury.jpg

Hospitals and clinics are paying BIG bucks to dispose of them. Yet the mercury contained is worth about $100.


<––- Knows where at least 5 grand worth of unwanted mercury is if a sphygmomanometer has $100 worth of mercury in it.

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Link Posted: 2/5/2012 1:53:42 PM EST
Originally Posted By Mr_Harry:
what it the difference between an oral and anal thermometer?

the taste

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Link Posted: 2/5/2012 1:57:03 PM EST
Originally Posted By Keith_J:

Originally Posted By Justa_TXguy:
You ought to see the mercury spill clean up kits we have at the hospital. If one of the old school blood pressure cuffs breaks, the liquid mercury is treated as if it's fucking uranium-laced anthrax.


And yet, years ago kids would do this for fun:

http://www.learnnc.org/lp/media/uploads/2009/05/mercury.jpg

Hospitals and clinics are paying BIG bucks to dispose of them. Yet the mercury contained is worth about $100.


Mercury is evil just like Dihydrogen Monoxide, carbon dioxide, and oxygen we must ban them for the children!
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Link Posted: 2/5/2012 2:00:37 PM EST

Originally Posted By Keith_J:

Originally Posted By Justa_TXguy:
You ought to see the mercury spill clean up kits we have at the hospital. If one of the old school blood pressure cuffs breaks, the liquid mercury is treated as if it's fucking uranium-laced anthrax.


And yet, years ago kids would do this for fun:

http://www.learnnc.org/lp/media/uploads/2009/05/mercury.jpg

Hospitals and clinics are paying BIG bucks to dispose of them. Yet the mercury contained is worth about $100.

Where do you sell mercury? Recycler? I have about 15 pounds of it.

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Link Posted: 2/5/2012 2:04:41 PM EST

Originally Posted By mattimeo:

Originally Posted By Keith_J:

Originally Posted By Justa_TXguy:
You ought to see the mercury spill clean up kits we have at the hospital. If one of the old school blood pressure cuffs breaks, the liquid mercury is treated as if it's fucking uranium-laced anthrax.


And yet, years ago kids would do this for fun:

http://www.learnnc.org/lp/media/uploads/2009/05/mercury.jpg

Hospitals and clinics are paying BIG bucks to dispose of them. Yet the mercury contained is worth about $100.

Where do you sell mercury? Recycler? I have about 15 pounds of it.

Hopefully in iron flasks. Anything over one pound in any shipment is considered hazmat.

Only certain recyclers take it because it is easy to contaminate with other metals.

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Link Posted: 2/5/2012 2:06:08 PM EST
[Last Edit: 2/5/2012 2:06:51 PM EST by Ohio]
This one will work

It's labeled that way due to regs...
It looks like a mercury one.
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Link Posted: 2/5/2012 2:10:48 PM EST

Originally Posted By Keith_J:

Originally Posted By mattimeo:

Originally Posted By Keith_J:

Originally Posted By Justa_TXguy:
You ought to see the mercury spill clean up kits we have at the hospital. If one of the old school blood pressure cuffs breaks, the liquid mercury is treated as if it's fucking uranium-laced anthrax.


And yet, years ago kids would do this for fun:

http://www.learnnc.org/lp/media/uploads/2009/05/mercury.jpg

Hospitals and clinics are paying BIG bucks to dispose of them. Yet the mercury contained is worth about $100.

Where do you sell mercury? Recycler? I have about 15 pounds of it.

Hopefully in iron flasks. Anything over one pound in any shipment is considered hazmat.

Only certain recyclers take it because it is easy to contaminate with other metals.

It's still in sealed Fisher Scientific bottles. I'm seeing that they go for like $400 something a pound new. Wow.


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Link Posted: 2/5/2012 2:24:50 PM EST
Originally Posted By Mr_Harry:
what it the difference between an oral and anal thermometer?


One needs salt.

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Link Posted: 2/5/2012 2:46:48 PM EST

Originally Posted By mattimeo:

Originally Posted By Keith_J:

Originally Posted By mattimeo:

Originally Posted By Keith_J:

Originally Posted By Justa_TXguy:
You ought to see the mercury spill clean up kits we have at the hospital. If one of the old school blood pressure cuffs breaks, the liquid mercury is treated as if it's fucking uranium-laced anthrax.


And yet, years ago kids would do this for fun:

http://www.learnnc.org/lp/media/uploads/2009/05/mercury.jpg

Hospitals and clinics are paying BIG bucks to dispose of them. Yet the mercury contained is worth about $100.

Where do you sell mercury? Recycler? I have about 15 pounds of it.

Hopefully in iron flasks. Anything over one pound in any shipment is considered hazmat.

Only certain recyclers take it because it is easy to contaminate with other metals.

It's still in sealed Fisher Scientific bottles. I'm seeing that they go for like $400 something a pound new. Wow.


Bottles are especially hazardous. Needs overpack which is mercury tight. Remember, over a pound is hazmat so they cannot go by common carrier.

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Link Posted: 2/5/2012 2:53:16 PM EST

Originally Posted By Keith_J:

Originally Posted By mattimeo:

Originally Posted By Keith_J:

Originally Posted By mattimeo:

Originally Posted By Keith_J:

Originally Posted By Justa_TXguy:
You ought to see the mercury spill clean up kits we have at the hospital. If one of the old school blood pressure cuffs breaks, the liquid mercury is treated as if it's fucking uranium-laced anthrax.


And yet, years ago kids would do this for fun:

http://www.learnnc.org/lp/media/uploads/2009/05/mercury.jpg

Hospitals and clinics are paying BIG bucks to dispose of them. Yet the mercury contained is worth about $100.

Where do you sell mercury? Recycler? I have about 15 pounds of it.

Hopefully in iron flasks. Anything over one pound in any shipment is considered hazmat.

Only certain recyclers take it because it is easy to contaminate with other metals.

It's still in sealed Fisher Scientific bottles. I'm seeing that they go for like $400 something a pound new. Wow.


Bottles are especially hazardous. Needs overpack which is mercury tight. Remember, over a pound is hazmat so they cannot go by common carrier.


I'll see if I can find someone within driving distance. I'm not shipping this shit anyplace. As it is, it's in garbage bags, in ammo cans, outside in a cool, ventilated building. We got paid by a guy to clean out his old man's workshop after he died, and I guess he used to do some kind of metalwork. We found this, the guy said to get rid of it, so I just took it since I wasn't going to pay the hazmat dump to dispose of the shit.

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Link Posted: 2/5/2012 2:57:01 PM EST
*post contains personal opinion only and should not be considered information released in an official capacity*
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Link Posted: 2/5/2012 3:07:36 PM EST
I have seen them in antique and junk shops occasionally.

Probably not the best option but you never know.


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Link Posted: 2/5/2012 3:15:42 PM EST

Originally Posted By mattimeo:
..
I'll see if I can find someone within driving distance. I'm not shipping this shit anyplace. As it is, it's in garbage bags, in ammo cans, outside in a cool, ventilated building. We got paid by a guy to clean out his old man's workshop after he died, and I guess he used to do some kind of metalwork. We found this, the guy said to get rid of it, so I just took it since I wasn't going to pay the hazmat dump to dispose of the shit.

You could transfer to smaller bottles, double pack them and sell to gold miners. Although there aren't any gold mines in Florida. Placer miners frequently use elemental mercury to amalgamate gold fines. Some miners just boil the mercury off, better miners use a mercury still to purify the gold.

Shipping is going to be the killer.
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Link Posted: 2/5/2012 3:16:20 PM EST
Good stuff for leaded barrels too.

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Link Posted: 2/5/2012 3:17:23 PM EST
Alcohol ones work just fine. Digital is better.

Mercury is no longer needed.

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Link Posted: 2/5/2012 3:21:28 PM EST
[Last Edit: 2/5/2012 3:25:03 PM EST by Jman78]
Originally Posted By Mr_Harry:
what it the difference between an oral and anal thermometer?


The taste....

Damn, beaten about 3.50 times.
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Link Posted: 2/5/2012 3:23:01 PM EST

Originally Posted By Keith_J:

Originally Posted By mattimeo:
..
I'll see if I can find someone within driving distance. I'm not shipping this shit anyplace. As it is, it's in garbage bags, in ammo cans, outside in a cool, ventilated building. We got paid by a guy to clean out his old man's workshop after he died, and I guess he used to do some kind of metalwork. We found this, the guy said to get rid of it, so I just took it since I wasn't going to pay the hazmat dump to dispose of the shit.

You could transfer to smaller bottles, double pack them and sell to gold miners. Although there aren't any gold mines in Florida. Placer miners frequently use elemental mercury to amalgamate gold fines. Some miners just boil the mercury off, better miners use a mercury still to purify the gold.

Shipping is going to be the killer.

Yeah. If I can't find a recycler, I'll eventually just take it to the hazmat dump. I'll have to get rid of it sooner or later, but if I can make money as opposed to spending it, I'd like to. (It's not that much to get rid of it, but we got paid $150 to fill a roll off that day, and we weren't interested in paying out of our $75 each, nor in pitching it in the roll off.)

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Link Posted: 2/5/2012 3:27:23 PM EST
Isn't it the vapors that are hazardous? An old guy told me that if you had a really dirty barrel, you could plug one end and fill it up with mercury, after a day or two, it would look brand new. I guess it creates an amalgam with the lead?

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Link Posted: 2/5/2012 3:27:34 PM EST
I have a laboratory type mercury filled thermometer, pretty cool, except it's in Centigrade and not Farenheit
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Link Posted: 2/5/2012 3:32:44 PM EST

Originally Posted By BillythePoet:
Isn't it the vapors that are hazardous? An old guy told me that if you had a really dirty barrel, you could plug one end and fill it up with mercury, after a day or two, it would look brand new. I guess it creates an amalgam with the lead?

Posted Via AR15.Com Mobile

Not really. Yes, the vapors can accumulate but in parts per million range at the most. Despite what the mercurophobes say, the human body has a pretty efficient mechanisms to excrete mercury in small doses associated with elemental mercury vapors.

There are far better ways to clean a firearm barrel. Mercury can work but it is slow. You have to brush the barrel clean, then it works best on lead. Yes, it dissolves the lead and copper.
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Link Posted: 2/5/2012 3:34:01 PM EST
Cities have been pulling them for a few years now. I might have an old one
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Link Posted: 2/5/2012 3:34:31 PM EST

Originally Posted By SplintNicket:
Originally Posted By Star_Scream:
Whats the appeal?


Posted Via AR15.Com Mobile


None for me, digital is a lot faster.

We've gone digital, much easier and faster

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Link Posted: 2/5/2012 3:34:43 PM EST

Originally Posted By AssaultRifler:
I have a laboratory type mercury filled thermometer, pretty cool, except it's in Centigrade and not Farenheit

I've got quite a few in Fahrenheit. If you want to trade
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Link Posted: 2/5/2012 3:35:36 PM EST

Originally Posted By Mr_Harry:
what it the difference between an oral and anal thermometer?

taste
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Link Posted: 2/5/2012 3:40:51 PM EST
[Last Edit: 2/5/2012 5:24:17 PM EST by ar-jedi]
Originally Posted By Keith_J:
Electronic require a reference voltage, this may or may not remain constant as the unit ages or the battery discharges.

if only there was some basic semiconductor characteristic that could be employed to make a reference voltage.
http://en.wikipedia.org/wiki/Bandgap_voltage_reference

if only there was a way to make a reference voltage completely independent of input voltage and temperature, with relatively low phase noise and good dynamic response.
http://en.wikipedia.org/wiki/Brokaw_bandgap_reference

if only there was a way to exploit bandgap physics in silion transistors, the result of which is a thermometer that only requires comparing two currents.
http://en.wikipedia.org/wiki/Silicon_bandgap_temperature_sensor

see also
http://www.national.com/rap/Application/0,1570,24,00.html
and
http://www.national.com/an/AN/AN-460.pdf

Bob Pease was an analog design legend; he did more to advance the art and propagate the knowledge than perhaps anyone, even Jim Williams (sad). if you come across texts from either of these authors, snap them up –– they are full of useful info well outside the usual domain of analog electronics.

see also the LM34 datasheet,
http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=lm34&fileType=pdf

and since a oral or rectal thermometer requires a display and a bit of logic, you can wrap all this functionality into one or two die, such as this overkill (note bandgap reference, and 13 bit (0.0625°C) temperature resolution, and accuracy: ±0.5°C from −40°C to +105°C. there is never any calibration needed; the bandgap voltage and derived current is a function of physics, not calibration.
http://www.analog.com/en/mems-sensors/digital-temperature-sensors/adt7410/products/product.html

summary:
these types of devices incorporating bandgap references are immune to power supply input variation, for example as the batteries age.

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Link Posted: 2/5/2012 4:32:43 PM EST
Originally Posted By Keith_J:

Originally Posted By BillythePoet:
Isn't it the vapors that are hazardous? An old guy told me that if you had a really dirty barrel, you could plug one end and fill it up with mercury, after a day or two, it would look brand new. I guess it creates an amalgam with the lead?

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Not really. Yes, the vapors can accumulate but in parts per million range at the most. Despite what the mercurophobes say, the human body has a pretty efficient mechanisms to excrete mercury in small doses associated with elemental mercury vapors.

There are far better ways to clean a firearm barrel. Mercury can work but it is slow. You have to brush the barrel clean, then it works best on lead. Yes, it dissolves the lead and copper.


So, unless you are using it to make felt, or mining for it, there is little to no risk? I have some in a jar that I pull out to amuse the kids occasionally, glad to hear that I won't be going crazy, lol.

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Link Posted: 2/5/2012 4:39:24 PM EST

Originally Posted By BillythePoet:
Originally Posted By Keith_J:

Originally Posted By BillythePoet:
Isn't it the vapors that are hazardous? An old guy told me that if you had a really dirty barrel, you could plug one end and fill it up with mercury, after a day or two, it would look brand new. I guess it creates an amalgam with the lead?

Posted Via AR15.Com Mobile

Not really. Yes, the vapors can accumulate but in parts per million range at the most. Despite what the mercurophobes say, the human body has a pretty efficient mechanisms to excrete mercury in small doses associated with elemental mercury vapors.

There are far better ways to clean a firearm barrel. Mercury can work but it is slow. You have to brush the barrel clean, then it works best on lead. Yes, it dissolves the lead and copper.


So, unless you are using it to make felt, or mining for it, there is little to no risk? I have some in a jar that I pull out to amuse the kids occasionally, glad to hear that I won't be going crazy, lol.

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Use of mercury in felt is long been stopped. And that was the nitrate of mercury which readily dissolves in water. Elemental mercury is virtually harmless.
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