Donkeys show how a hygrometer works

This blog post has transferred from my Geography teaching blog, where it served its purpose last week of entertaining and educating Year 7 who are currently studying Weather and Climate, and learning about weather instruments in the school weather station. Then my donkeys helpfully demonstrated how a hygrometer works.


I installed a small weather station called a “banjo barometer”so the donkeys can see what the weather is going to be like, and can go in the stable when it looks as if it might rain,   You can see it behind Matilde in the photograph above: it is the green object on a corner post of the stable.  You can see why it is called a “banjo” because it looks like the musical instrument. These contain a thermometer, a barometer (the large dial) and a hygrometer (the small dial).

chewed weather station

One of the donkeys decided to eat the hygrometer. I do not know which rood and norty donkey did it.  The evidence is the teeth marks on the green wooden banjo, and the missing hygrometer.  The transparent plastic case was gone, but the metal inside of the hygrometer had been chewed up and spat out on the floor.


Rubí usually eats nearest to the weather station, but she is probably not to blame.  It is Aitana who always explores anything new that arrives on the field and tests it to see if it is edible.

Donkeys demonstrate hygrometer

Here is Aitana exploring a brush to see if it is edible.

This was all a bit disappointing until, suddenly I realized what the donkeys were really trying to do: they wanted to show Year 7 pupils how a hygrometer works!  So we passed the donkey-chewed hygrometer around the class to see how it works!

This type of hygrometer is a Mechanical hygrometer and its metal coil is tightened or loosened by the presence of moisture, turning the needle to show humidity.


Thank you donkeys for demonstrating how a hygrometer works.

Rubí’s Tuesday Blogpost:
For those of you who appreciate the occasional post from Rubí, when she has her thinking day on Tuesdays, she has told me that she wants to write about astronomy in this Tuesday’s post.  Rubí is always interested in the moon but she has noticed that we now have four moons instead of one, and she has a theory about it.

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