Two factors dictate the design of an ideal brace: 1  Joints adjacent to the thumb CMC joint must be excluded to maximize function when wearing the brace; thus a design using three points of pressure cannot be used. 2  The brace must specifically prevent CMC dorsal translation.
Expansion valve. An expansion valve is a valve used for different purposes: Steam engines. A valve used to control the expansion of steam: Expansion valve (steam engine) The best-known of these was the Meyer expansion valve, the invention of Jean-Jacques Meyer.
Ivan Polzunov and the First Two-Cylinder Steam Engine. Ivan Polzunov was a Russian inventor who built the first steam engine in his country. Polzunovâs two cylinder steam engine was more powerful than the English atmospheric engines.It had a power rating of 24 kw. Polzunovâs model of a two cylinder steam engine is presently displayed the Barnaul Museum.van Polzunov and the First Two-Cylinder Steam Engine. Ivan Polzunov was a Russian inventor who built the first steam engine in his country. Polzunovâs two cylinder steam engine was more powerful than the English atmospheric engines.