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The metronome was invented by Dietrich Nikolaus Winkel in Amsterdam in 1812. A man called Johann Maelzel copied Winkelâs ideas and improved them. He made a small, portable metronome which was patented in 1816. The metronome made it possible for a composer to show the performer what speed he wanted. If the composer writes at the top of his music: Crotchet (quarter note) = 76, for example, then the metronome can be set at 76 and it will tick at the right speed for that piece of music. Sometimes they write MM76.
In the nineteenth century they discovered plastics based on chemically modified natural polymers: Charles Goodyear discovered vulcanization of rubber (1839) and Alexander Parkes, English inventor (1813â1890) created the earliest form of plastic in 1855.