tachometer etymology

Etymology

The word "tachometer" comes from two Greek roots:

• tachos: meaning "speed" or "rapidity"
• metron: meaning "measure" or "instrument"

Meaning

A tachometer is an instrument used to measure the rotation speed of a shaft or other rotating object. It is typically displayed in revolutions per minute (RPM).

Origin

The first tachometer is credited to James Watt, the inventor of the steam engine, in the late 18th century. Watt's tachometer used a centrifugal governor to measure the speed of a rotating flywheel.

Over time, tachometers have evolved in design and accuracy. Modern tachometers use various technologies, such as:

• Magnetic: Uses a permanent magnet and a coil to generate an electrical signal proportional to speed.
• Optical: Uses a laser or LED to measure the time it takes for a reflective marker on the rotating object to pass by.
• Vibrating reed: Uses a vibrating reed that resonates at a frequency proportional to speed.

Tachometers are used in a wide range of applications, including:

• Automotive dashboards
• Industrial machinery
• Power tools
• Aerospace and marine engines

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