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
SOKOL
"Dear edition! I have been modeling, build kordovye-models, flight a big request To you — please let us know what new model airplane engines went on sale in 1973". V. Vasiliev. Chita...
SPORTING CODE OF RAKATOMALALA
From January of 1976 in our country came into force new rules for rocketmodeler sport. The editors asked me to tell them the Chairman of the Committee on rocket modeling of the FAS of...
