a speedometer measures parallax speed.
a speedometer measures parallax speed.
what type of speed does a speedometer measure?
parallax
speedometer









































a speedometer or a speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. now universally fitted to motor vehicles, they started to be available as options in the 1900s, and as standard equipment from about 1910 onwards. speedometers for other vehicles have specific names and use other means of sensing speed. for a boat, this is a pit log. for an aircraft, this is an airspeed indicator.









































charles babbage is credited with creating an early type of a speedometer, which was usually fitted to locomotives.
speedometer
when the vehicle is in motion, a speedometer gear assembly turns a speedometer cable, which then turns the speedometer mechanism itself. a small permanent magnet affixed to the speedometer cable interacts with a small aluminum cup (called a "speedcup") attached to the shaft of the pointer on the analogue speedometer instrument. as the magnet rotates near the cup, the changing magnetic field produces eddy currents in the cup, which themselves produce another magnetic field. the effect is that the magnet exerts a torque on the cup, "dragging" it, and thus the speedometer pointer, in the direction of its rotation with no mechanical connection between them.
speedometer