As the Russian proverb says, “water will find a hole”. And one that cannot be detected “by eye”. Help out in this case a bucket of water. Drop it into a “soggy” boot and squeeze, tightening the top shaft: emerging air bubbles from the holes will be given where it “hides”.
Recommend to read
ELECTROSCOPE WITH INDICATION OF THE SIGN
The well-known school electroscope, which demonstrate the phenomena of electrostatics, determines only the presence of electrostatic charge. What is it, positive or negative, we can only...
ADJUSTABLE PLIERS
the Owners of the most different techniques faced with a secret or castellated nuts. You can make a master key from an ordinary pair of pliers. For this purpose, the ends of the handles...
