Day 249~366

Yay now Autumn has arrived we’re having summer! 🙄 with nice warm days predicted by the BBC weather lady. I beg to differ 🙂

Aneroid barometers have a sealed, air-tight metal box inside. As air pressure rises or falls, the box either squashes inward a tiny bit or flexes outward. A spring is cunningly attached to the box and, as the box moves in and out in response to the changes in air pressure, the spring expands or contracts and moves the pointer on the dial. The dial is calibrated (marked with numbers) so you can read the air pressure instantly. Aneroid barometers measure the air pressure when you knock their glass faces. When you first inspect them, the needle shows the pressure as it was when you last looked at them—however long ago that might have been. Give the glass a sharp tap and the needle will jump to a new position showing the pressure as it is now. The way the needle moves is important. If it moves clockwise, up the dial, the pressure is increasing so the weather is likely to be getting hotter, drier, and finer; if the needle turns counterclockwise, the pressure is decreasing and the weather is likely to get cooler, wetter, and poorer.
There are lots of different units you can use for measuring pressure, in the old days it was ‘Atmospheres’,’Torrs’,& ‘millibars’, though these days pascals and kilopascals are the preferred scientific units to use.

I just read what the needle points at.

day249w

 

21 Comments

  1. Nice barometer, FR. And nicely photographed too.
    Best wishes, Pete.

    Liked by 1 person

    1. Thanks Pete, I am going to do my own forecasting now, the Beeb has let me down too often 😀

      Like

      1. I generally rely on burning joints to predict rain. When all else fails, I look out of the window!

        Liked by 1 person

  2. My head is my barometer :). Nice shot Fraggy. And like beetleypete, yes joints too:)))

    Liked by 1 person

    1. Well I guess if you smoke enough…. 😂😂

      Liked by 1 person

      1. Silly girl , living by the lake I always no when the rain or snow is coming , I get a headache

        Liked by 1 person

  3. I love those old mechanical instruments. And you captured it beautifully in this black and white image. Furthermore, it looks like you have come out of a big storm lately. So, enjoy the last days of sunshine.

    Liked by 1 person

    1. Will do, thanks Otto.

      Liked by 1 person

  4. I was fascinated by the barometer as a kid – it was awesome to knock it and see what the weather would be changing to. Based on a summer of poor weather predictions here, this seems like a far more accurate method!

    Liked by 1 person

    1. It would be if it was in working order lol, just realised it isn’t 🙄

      Liked by 1 person

      1. Well, so long as the weather stays the same, you’re good!

        Like

  5. Nice shot. Something grandfatherly about it.

    Liked by 1 person

    1. Yes it’s an old boy 😊 cheers Jay.

      Like

  6. When I was young we often stayed on my uncle’s farm. In the dark old farmhouse there hung a barometer on the wall. I always asked my father how it worked. I don’t think he knew – all he ever replied was – “I don’t think that thing works anymore”. Maybe he did not know about the tapping thing?!

    Liked by 1 person

    1. Yes you definitely need to tap. Cheers FD

      Like

  7. That is one stylish barometer. Almost looks like an antique clock.

    Liked by 1 person

      1. I want a barometer like that.

        Liked by 1 person

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