Useful and interesting. Page 81
Master classes:

Homemade barometer
It is not always possible to buy a barometer, so I would like to propose the design of a home barometer that will show atmospheric pressure with some accuracy.


Homemade tripod
If you don’t have a tripod at all or are too lazy to carry it with you all the time, then this homemade product is for you. This very simple device will help make photos clearer in low light conditions. Of course, this is not a panacea for blurred

Experiments with ferromagnetic fluid
This “liquid” consists of tiny particles of matter that are attracted by a magnet. . .

How to use a refrigerator compressor as an airbrush
Most people have an old refrigerator in their garage or shed. Why do they store it? unknown! If you are one of those people, then I suggest using this “hardware” for business. . .

DIY CD stand
The eternal problem - what to do with old CDs? It's a shame to throw it away. . . Here's an idea - an original stand for various office supplies.