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
“SWAN LAKE”
While on vacation in Anapa with a group of tourists during a short-term bus stop near one of the nearby houses saw in the front garden and managed to photograph is my favourite, "a lake...
“DISAPPEARING” STAIRS
A lot of trouble delivers the design of internal stairs, for example, the attic. For convenient large marches, as a rule, not enough space and they are very steep, which is dangerous,...
