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
MANUAL MILL
Present Board milling machine come in handy craftsmen who love to work with wood to get the blanks embossed surfaces, various geometric patterns, as well as cutting slots, grooves,...
FROM VELCRO — BRUSH
Clasp type "burdock", which is widely used on jackets and other apparel, consists of a strip with a loop surface and pressed against her other band with a dense network of small hooks....
