Light bulb barometer. Drawing, description

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Light bulb barometer. Children's Science Lab

Children's Science Lab

Take a burned-out light bulb, he writes, and where the base with the threaded part begins, carefully drill a small hole with a diameter of 2-3 mm. This should be done very carefully, otherwise the balloon may crack or break.

Here is the easiest way to drill glass. At the point where you marked the hole, apply a drop of machine or sunflower oil. Take the abrasive powder from medium-grained sandpaper and add it to the oil drop to make a viscous paste, a little thinner than toothpaste. Then clamp the copper wire in the drill chuck. Its diameter should correspond to the size of the hole you want to drill. Gently clamp the lamp base in a vise. And wrap the glass flask with a towel or rag.

You need to drill very carefully, applying minimal effort.

When the hole is drilled, pour tap water into it, filling the glass flask up to half. Then add two or three drops of ink or a piece of indelible pencil lead into it and mix. The barometer is ready.

light bulb barometer

It remains to wait until the inner wall of the flask dries out, and hang the barometer between the window frames. Best of all, on the north side, where direct sunlight will not fall on it. If the windows face south, install at the top of the window. You can take readings after a few hours. Our barometer can predict the weather for the day quite completely. Overcast or partly cloudy awaits us, a bucket will set in. Or it will rain a small, long, short-term, maybe thunderstorm ...

True, you need to know some features in order to decipher the testimony.

Suppose the inner walls of the light bulb are covered with small drops of condensed water - tomorrow it will be overcast, but without precipitation.

light bulb barometer

Partly cloudy - the walls of the bulb were covered with drops of medium size, and vertical dry stripes formed between them.

If the walls are partially covered with large drops of dew, expect short-term precipitation. And from top to bottom, and drops, growing larger, flow down - there will be a thunderstorm.

light bulb barometer

Large drops are only at the surface of the water, and the neck of the bulb is dry - the rain will pass by, 30-60 km from your places.

It is raining outside the window, and the walls of the light bulb have become completely dry, without fog and droplets - excellent weather will set in tomorrow.

And if dew drops appeared only on the north side of the balloon, expect rain tomorrow afternoon.

Of course, you can use such a barometer only if the air temperature is above zero, that is, in spring, summer and early autumn.

Author: M.Efremov

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