Erm A strange one Maximun Therometer

[The PIT]

Just bought a new one from met check after breaking the other some time back. It flew out of my hands when shaking it down and decided to avoid the pond and chose the concrete instead. Smassshhhhh!!!!!

Anyway got a new one and I noticed straight away that instead of keeping the max value like it should it will drop a few degrees. Now you supposed to tilt them at 2 degree's. Anyway I tried it level better and then sloping down so in theory it should actually go higher if disturbed. The max value yesterday was 11.1C this morning it read 8.4C. I'm surprised really as it is really difficult to shake down. The only thing I can think off it's rocking in the holder and that's causing it to drop down. 

At the moment it's in the house and it'll be interesting if it drops overnight as the heating goes off.

[Terminal Moraine]

That is very unusual, Pit. My first thought was that the constriction was too large but that can hardly be the case if the thermometer is difficult to re-set. In over 50 years of recording I've never had one which altered by such a large amount. I'm also wondering what is the liquid in the column?  Presumably not mercury if it's a new thermometer, so could it be that the liquid isn't viscous enough to be held back by the constriction and gradually seeps back?

In my experience it would have to rocking a heck of a lot to shake the column down by 2.7c, I've known it happen with minimum thermometers during prolonged severe gales where the screen is  vibrating so much that the indice ends up in the spirit column but never with a max' thermometer. I'd be interested to know the outcome of this.

[The PIT]

It's a mercury substitute. The min doesn't show any issues.

[The PIT]

Well yesterdays test was inconclusive dropped by 0.5C but the room didn't colder by very much.

[The PIT]

Moved the thermometer out into the outside loo which is a lot colder than the rest of the house. The only heating in there is heating pump. Anyway the temperature has only gone down 0.2c which allowing fro me moving it to check the reading is probably right. So I'm thinking the Thermometer must be rocking as the clips are lose as this must be causing the problem.

[The PIT]

The Thermometer is now back in the screen with a new set of clips. These don't allow for movement.  Never dropped in the other location so I will find out tomorrow.

[The PIT]

And guess what the temperature dropped. So I rung metcheck up and got a returns number hopefully the swapped one will do better.