Friden STW-10


The division by zero on the Friden calculator is one of my most popular video. Stay until the end for a special treat!

This is a favorite of mine, the Friden March. Who knows a mechanical calculator could be a musical instrument. It also shows the very impressive internals of the calculator.

This demo goes through the various functions of the calculator, following the short introduction manual.


See the Friden restoration page for info and documentation.