It is convenient to create a temporary memo — whether it is preparing the card for your file, or just notes about the latest Affairs in the coming days, or envelopes with letters awaiting answer: they are placed between the turns of the springs (preferably of large diameter). Ensure that the spring does not ride, attach the ends of tin or cardboard cheeks.
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AGAIN ABOUT BIOGAS
The editors have received many letters on the publication of "Biogas: and warms, and cooks" (see "M-K" № 1, 1987), based on the materials of the Romanian journal "Technium". Of readers...
SAWDUST RELIABLE
A screw or bolt connection details are often attenuated vibrations. Offer when assembling sprinkle the threaded surfaces tin lead IPE sawdust to screwing it does not hurt (thanks to...
