In the holes drilled in a wooden tube in the concrete wall, there is always a lot of sand and dust. To remove them will help plastic or metal tube by simply inserting it into the hole and how to blow into it (but mind your eyes!).
S. DOROFEEV, p. vokhtoga, Vologda region.
Recommend to read
FRIGATES FOR EXPORT
The collapse of the colonial system after world war II and the emergence on the map of many independent States initially did not affect the balance of power in the oceans. "Microscopic"...
THE GERMAN-CONTROLLED TORPEDOES
The development of guided torpedoes to sabotage units of the German fleet was conducted in parallel with the creation of the midget submarines. The first model of this weapon was...
