On Monday, 26 December 2016 16:32:25 UTC, Bernard Burton wrote:
"Vidcapper" wrote in message
...
On 26/12/2016 11:31, Desperate Dan wrote:

Met office mercury in glass thermometers have a five year calibration
period.


Why just 5 years - surely the only thing that can go wrong is if you drop
them?

--

Paul Hyett, Cheltenham

Not so. The glass can creep due to changes in the glass of the bulb, which
contracts slowly over time.

--
Bernard Burton

Satellite images and weather data for Wokingham at:
www.woksat.info/wwp.html



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Mercury thermometers can be fairly accurately home-calibrated using a bucketful of partly melted slush. Use as large a volume as possible and stir it for a long time but make sure there is ice present. The maximum thermometer will have to be stuck in the fridge, rapidly shaken down and placed in the bucket and the maximum temperature read. The amount of dissolved solid even in the hardest water is so small that the melting point will not be materially lowered. I've done this with every thermometer I've had. Slush, not available as a natural product these days, can be obtained from the fridge - just let it build up over the weeks.

Tudor Hughes.

That's a check st, presumably, zero, not a calibration.

On Monday, 26 December 2016 09:56:25 UTC, wrote:

The national maximum temperature yesterday (the 25th December 2016))was 15.1C at Aboyne. However, 15 miles from Aboyne, we measured 15.5C. We have a good open observing site, a Stevenson Screen and the same thermometers the MO use, though these are about 40 years old.

But the MO won't want to know, of course.

Us thaumaturges do though. Especially those of us who like to show off. I don't suppose you know any old fashioned meteorologists that can help you understand what was going on?

On Monday, 26 December 2016 11:31:44 UTC, Desperate Dan wrote:
Met office mercury in glass thermometers have a five year calibration period.

How do they get it back in once they have tested it?
Do they unscrew or what?

On Monday, 26 December 2016 16:32:25 UTC, Bernard Burton wrote:
"Vidcapper" wrote in message
...
On 26/12/2016 11:31, Desperate Dan wrote:

Met office mercury in glass thermometers have a five year calibration
period.


Why just 5 years - surely the only thing that can go wrong is if you drop
them?

--

Paul Hyett, Cheltenham

Not so. The glass can creep due to changes in the glass of the bulb, which contracts slowly over time.


So he can't use his as a rule.

On Monday, 26 December 2016 17:45:43 UTC, Crusader wrote:
On Monday, 26 December 2016 16:36:24 UTC, Ken Cook wrote:
Mercury thermometers being phased out at all MetO sites beginning 2017. Not sure what we'll get as replacement yet.
Ken
Copley
Teesdale

The "official" recording of Met office site temperature data has been switched to ERT thermometers for a quite a few years now, using mercury kit only as a backup. The Met Office observing Network, recently/currently being renamed SurfaceNet is totally electronic, and has been since the old defunct SAMOS network back around the Y2K era. SAMOS was the mainstay of the observing network from the mid 90s.

How come we never got to help rename it Boaty Mr Boatface or Nett Superficiality?
(I think it is time for me to go and play somewhere else, all this realism is deafening me to the truth.)

Mercury in glass has until recently been used as a backup...this has been stopped also by now at all MetO manned sites...or was instructed to have been stopped over a year ago! I believe a few sites may still keep mercury in the background store rooms etc.

Which work best in engine plumes on runways and what is their definition of "best"?

The remaining observation stations at third party sites or at the sites of collaborating organisations will have MIG thermometers taken away during 2017.