The piano is an acoustic, keyboard and stringed musical instrument in which the strings are struck by wooden hammers that are coated with a softer material (modern hammers are covered with dense wool felt; some early pianos used leather). It is played using a keyboard, which is a row of keys (small levers) that the performer presses down or strikes with the fingers and thumbs of both hands to cause the hammers to strike the strings.
invented by John Roebuck
The lead chamber process was an industrial method used to produce sulfuric acid…
invented by William Cullen
The term refrigeration means cooling a space, substance or system to lower…
invented by Otto von guericke
An electrostatic generator, or electrostatic machine, is an electromechanical…
invented by Hans Lippershey
telescope is an optical instrument using lenses, curved mirrors, or a…
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