In construction you often have to deal with the internal measurements. For example, to determine the distance between the form panels, the value of the window or doorway. A good assistant in such cases would be sliding ruler, made of tube and metal rod with applied risk. V. ANTIPIN
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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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Agree, this is tempting: from ordinary tables to create a dressing table with chair; easel for young artist; a stand where you can show movies and slides, and to store the projector box...
