
A simple “opener” for metal cans with lacquer or varnish can be done in just a minute from block of wood and two nails.
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METAL — WOOD
What does a person do when solid food is "too hard"? Goes on soft! Here also it is necessary to do with an old or broken drill bit for metal. Sharpen its end, as shown in the figure, and...
SIKORSKY H03S (S-51) DRAGONFLY
Igor Sikorsky, an outstanding Russian aircraft designer and industrialist, was one of the pioneers of aviation in Russia. Characteristically, the first aircraft built by Sikorsky in the...