It is known that under the influence of moisture flat sheets of paper or cardboard several diverging and begin to warp. This quality can be used for production at home is simple device, clear from the picture. Strip of Kraft paper (used generally for packaging of goods),mounted on a rack connected with the arrow pointing to the graduations marked on the results of your previous observations. With the change in humidity of the air strip will pull the up arrow — “clear” or lower down — “rain”.
Recommend to read
PODOGORICA
Using the principle of producing hydrogen by electrolysis of aqueous alkali, as described in the journal "modelist-Konstruktor" No. 7 for 1980, I decided to make more simple and compact...
BOX OF MUSHROOM
Purchasing a road bike, it was a sin for mushrooms do not go! From Kronstadt on the dam on the Northern coast of the Gulf of Finland, next to Sestroretsk in the Vyborg side, 54-th...
