Interesting artefact.
"The Sinclair Instrument Wrist Calculator was a simple 8-digit calculator, that was only sold as a mail-order kit. It was released in February 1977 by Sinclair Instrument, a company ran in parallel with Sinclair Radionics. It originally sold for £9.95 (plus VAT)."
https://www.computinghistory.org.uk/det/52845/Sinclair-Instrument-Wrist-Calculator/
TubeTime on Twitter has a thread that looks at the internals of this calculator. Fascinating stuff.
"Tube Time @TubeTimeUS
this is one of the world's first electronic calculators, the Friden EC-130, which came out in 1964! it's a really fascinating machine, so let's look at it in more detail."
https://twitter.com/TubeTimeUS/status/1312919889468817410
#History #Calculators #CalculatorHistory #Electronics #Engineering #Technology
