If, during the filling of high capacity water (e.g. drums) intended for watering the garden, throwing a rubber ball of small size, its appearance over the edge of prompts to close the valve. Thereby eliminating the need for constant monitoring of the level of a cursory glance.
N. SVIRIDENKO, p. Pervomayskiy, Kazakhstan
Recommend to read
RIDING FAN
This single machine with "air cushion" created in the engineering laboratory of the Leningrad Palace of pioneers named after A. A. Zhdanov. One engine from the motorcycle, rotate the fan...
STATIONERY IN… DRILLS
It would seem that can be the total electric drill hole puncher, washing rubber (eraser) and a paper clip? But O. Lavrov, who considers himself a graduate of our magazine, was able not...
