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
ANTENNA UHF
For sure the television reception in the range of decimeter waves, recommend using double spiral antenna, the production of which under force even to the beginner. With linear...
GARDEN “ROASTER”
Barbecue has long been the international (or interregional) Russian dish, spreading throughout the former Soviet Union and even beyond. Every connoisseur of this dish is your "brand" the...
