On Mon, 02 Jun 2008 22:40:56 +0100, Dave wrote:

I wanted to show our g daughters what we used for a calculator before
electronic calculators came into existence, but it has developed a fault.

Of course, those in the know used a Curta!

http://www.vcalc.net/curta_simulator_en.htm

--
the dot wanderer at tesco dot net