Shovels, hoes, axes — any cutting tool before sharpening, it is useful to hold at least an hour in a weak solution of
salt and, without wiping, start sharpening metal will be easier to sharpening.
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Security Alarm
This security alarm device (SAD) is intended for automatic sounding of an alarm signal (electric bell) in case of unauthorized entry of outsiders into a protected premises — an apartment,...
PODOGORICA
Using the principle of producing hydrogen by electrolysis of aqueous alkali, as described in the journal "modelist-Konstruktor" No. 7 for 1980, I decided to make more simple and compact...
