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
COME ON, MIRROR, TELL ME…
If in the examination of any massive constructions (e.g. motor vehicle or its running gear) there is a need to inspect it from below, it will help the mirror. So that it is always at...
FURNITURE A “DESIGNER”
As soon as we hear the word "designer" as we have before us the first thing to appear beloved by many children children designers, which are so interesting to collect machines, tools,...
