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”.
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