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.
Leonardo da Vinci at the beginning of the 16th century was credited with inventing the first hygrometer that used a ball of wool to provide this indication of humidity level. First Mechanical Air Cooler. Da Vinci was likely the first to use a mechanical air cooler. This air cooler consisted of a hollow water wheel with an air passage constructed to guide the air from the water wheel to his patron's wife's boudoir. The air was cooled by the splashing and evaporation of water during operation of the water wheel.