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#1
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![]() "Roland Perry" wrote in message ... In message , at 18:30:37 on Mon, 18 Jul 2016, tim... remarked: It's every much the same sort of thing: banning a commodity because it's harmful/unethical or whatever. There is a mile of difference between unethical and harmful, especially when in normal use the item isn't harmful at all, it's only harmful if it's abused. Ivory hunting is harmful to elephants. I was referring to the mercury instrument (I thought that was bleeding obvious) tim |
#2
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In message , at 10:25:58 on Tue, 19 Jul
2016, tim... remarked: It's every much the same sort of thing: banning a commodity because it's harmful/unethical or whatever. There is a mile of difference between unethical and harmful, especially when in normal use the item isn't harmful at all, it's only harmful if it's abused. Ivory hunting is harmful to elephants. I was referring to the mercury instrument (I thought that was bleeding obvious) The problem with mercury is that even if not "abused" (whatever that means) it has a tendency to get split, and when it does the tiny droplets run everywhere and are very difficult to clean up. -- Roland Perry |
#3
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![]() "Roland Perry" wrote in message ... In message , at 10:25:58 on Tue, 19 Jul 2016, tim... remarked: It's every much the same sort of thing: banning a commodity because it's harmful/unethical or whatever. There is a mile of difference between unethical and harmful, especially when in normal use the item isn't harmful at all, it's only harmful if it's abused. Ivory hunting is harmful to elephants. I was referring to the mercury instrument (I thought that was bleeding obvious) The problem with mercury is that even if not "abused" (whatever that means) it has a tendency to get split, and when it does the tiny droplets run everywhere and are very difficult to clean up. thermometers are sealed units (I have no idea about barometers, but assume likewise) tim |
#4
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In article ,
"tim..." wrote: thermometers are sealed units (I have no idea about barometers, but assume likewise) There may be sealed versions but the point about a mercury barometer is that it's influenced by atmospheric pressure and the most basic version is an open dish with a long tube immersed in it. I'd guess old versions are most likely to have mercury open to the atmosphere. Sam -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. |
#5
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![]() "Sam Wilson" wrote in message ... In article , "tim..." wrote: thermometers are sealed units (I have no idea about barometers, but assume likewise) There may be sealed versions but the point about a mercury barometer is that it's influenced by atmospheric pressure and the most basic version oh yes how silly of me :-( tim |
#6
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tim... wrote:
"Roland Perry" wrote in message ... In message , at 10:25:58 on Tue, 19 Jul 2016, tim... remarked: It's every much the same sort of thing: banning a commodity because it's harmful/unethical or whatever. There is a mile of difference between unethical and harmful, especially when in normal use the item isn't harmful at all, it's only harmful if it's abused. Ivory hunting is harmful to elephants. I was referring to the mercury instrument (I thought that was bleeding obvious) The problem with mercury is that even if not "abused" (whatever that means) it has a tendency to get split, and when it does the tiny droplets run everywhere and are very difficult to clean up. thermometers are sealed units (I have no idea about barometers, but assume likewise) Barometers measure atmospheric pressure, so they have to be open to the atmosphere to do this. -- Jeremy Double |
#7
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tim... wrote:
"Roland Perry" wrote in message ... The problem with mercury is that even if not "abused" (whatever that means) it has a tendency to get split, and when it does the tiny droplets run everywhere and are very difficult to clean up. thermometers are sealed units Until they get broken, like the one in my dad's greenhouse which I used to push the droplets around the wooden shelf with a long nail. (I have no idea about barometers, but assume likewise) The mercury column needs to be open to air pressure, but I guess there could be a sliding piston arrangement of some kind to achieve it. My dad has a large mercury-column barometer, which IIRC claims to be spillage-proof even if turned upside down accidentally during transport, so there must be a seal of some kind. Anna Noyd-Dryver |
#8
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On 19/07/2016 11:02, Roland Perry wrote:
In message , at 10:25:58 on Tue, 19 Jul 2016, tim... remarked: It's every much the same sort of thing: banning a commodity because it's harmful/unethical or whatever. There is a mile of difference between unethical and harmful, especially when in normal use the item isn't harmful at all, it's only harmful if it's abused. Ivory hunting is harmful to elephants. I was referring to the mercury instrument (I thought that was bleeding obvious) The problem with mercury is that even if not "abused" (whatever that means) it has a tendency to get split, and when it does the tiny droplets run everywhere and are very difficult to clean up. I can remember playing with blobs of mercury when I was a kid, great fun chasing them round the table.... Colin |
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