Possible mercury for old manometers
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Thread: Possible mercury for old manometers

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    Senior Member Rob Axel's Avatar
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    Possible mercury for old manometers

    A while back a member here sent me a old 4 tube manometer.. it had just enough mercury to use it on a fuel carb set up... I don't have a 4 so it is no issue. I have heard mercury can be had if you know say.. a high school science teacher.. but some people may not have that luxuary..
    Recently I was at a HVAC supply house to purchase filters.. and what to my wondering eyes did appear????
    A box.. with the words "recycle your old thermostat".. MERCURY thermostat..
    I spoke With the guy behind the counter, informed him of my need for that magical silver liquid... he said "take what you need".. I grabbed a couple and headed out giggling like a mad scientist ..
    Gonna do some research before I crack these viles open and add to what I have...
    Just thought I would pass it on to anyone that may have a old one stashed, guages work "OK" and I have made manometers using clear tubing and old oil..
    But that Heavy Metal is so nice ...Possible mercury for old manometers-img_8023.jpg
    "Yes, my hands and nails have grease stains. I ride vintage!"
    -xulf13-

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    Senior Member WintrSol's Avatar
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    Make sure you wear gloves and eye protection, remove all jewelry, and work in a cold environment - mercury evaporates (slowly) at room temperatures and above, so I would work in a ventilated space. Also, look out for any particles floating on it, especially red-colored bits, as that can be explosive. Keep any vials out of direct sunlight, which is what forms those explosive bits. Mercury was the reason hatters went mad, BTW, so handle with care. If you do spill any, have some copper or brass wool handy to mop up those tiny balls of it that scatter everywhere.
    Rick

    Mine is a mostly 1970 CB450K3

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    Senior Member Rob Axel's Avatar
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    Will do.. much appreciated information..
    "Yes, my hands and nails have grease stains. I ride vintage!"
    -xulf13-

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    Senior Member pemdoc65's Avatar
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    Keep it where no kids can find it. They like to play with it, and have no idea what it is or how toxic it can be.
    WintrSol and Rob Axel like this.
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    Senior Member Rod Fryatt's Avatar
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    Another source of mercury worth trying are clock repairers. Many of us repair barometers as well, and save the mercury from old tubes that we replace. We also use it in regulator pendulums.
    After 30 years in the trade I've got loads of the stuff but I'm over the water. Flowers of sulphur recommended to absorb spillage.

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    Supporting Member jd50i's Avatar
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    Might be easier and safer to replace the mercury with another liquid. From what I have found https://www.quora.com/Can-any-fluid-...in-a-manometer

    "Yup, any liquid can be used.

    The reason why mercury used is because it has high density. Hence for same pressure difference, we need small column height compared to other liquids. As
    P = density*g*height
    In fact if you want to measure very small pressure variation with high accuracy, you should use a less denser fluid as it will give longer column deviation.
    So basically, As far as you are using density value of the liquid used , any liquid will work in a manometer."
    Jim

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    Senior Member Carnivorous Chicken's Avatar
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    Just as an FYI, there is a guy in Oregon who still sells mercury sync tools -- a little google searching and you can find him. He also sells vials of mercury for replacement. I ordered some (in 2015), he shipped it to me in Boston, and it arrived no problem. I've since switched to a Morgan Carbtune and am happy with it.
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    Senior Member ancientdad's Avatar
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    and to think we all played with a little mercury in elementary school... who knew it was quite so toxic then
    Tom

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    Senior Member WintrSol's Avatar
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    Quote Originally Posted by ancientdad View Post
    and to think we all played with a little mercury in elementary school... who knew it was quite so toxic then
    We 'played' with it in high school science class. The year before, someone left a sealed test tube of it on the windowsill, out of sight, and we found it, full of a reddish compound. The teacher wouldn't touch it. We took it outside and gave it a good toss - BOOM! Same stuff that used to be in the firing caps for firearms. The good ole days!
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    Rick

    Mine is a mostly 1970 CB450K3

  11. #10
    Senior Member mike in idaho's Avatar
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    No mercury for Me, I have enough toxic crap around here already. I've had a set of gauges for years, they work just find, no need to figure out a way to hang yards of hose up so things don't spill.
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