Arrow speedometer
The basic ideas behind this arrow speedometer were
published in
the European Journal of Physics, nr. 13 1992.
The complete article can be found at
http://www.student.utwente.nl/~sagi/artikel/speed/arrow.html
This one was built in 1995 by Göran Nordström and Bertil
Olsson.
The speedometer displays the arrow velocity in meters
per second and feet per second.
The accuracy is better than 1% and the repeatability is better than 0.5%.
