If you do not have a special needle for inflating nipple of a volleyball or soccer ball, take advantage of… ordinary medicine dropper with an elongated spout. Rubber part is a bit cut and put on the pump hose, and the glass type in the pin hole of the ball. Pumped the ball a “needle” much quicker. N. ZHIRKOV, Lipetsk
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...
“Silver” motor plow
The All-Union Competition “Small Mechanization”, held by the editors of the magazine “Modelist-Constructor”, has gained wide popularity among the creators of small-sized agricultural...
