15-04-2020, 07:24 AM
I'd forgotten about the Sinclair Executive. Never owned one or wanted to back in the day. Or could afford it at age 16 when it was £80.
An odd fusion of slide rule and four function calculators was the Faber Castell TR1, 2 and 3. The last gasp of possibly the finest slide rule manufacturer against the rising tide of the the pocket calculator. Towards the bottom of this page https://www.sliderulemuseum.com/Faber.htm .
For decades prior to that they produced a selected number of slide rules with an "Addiator" on the reverse side. That was a mechanical add/subtract machine, very thin, that could be operated with a little stylus that came with the slide rule. Again shown in the above slide rule site.
Craig
An odd fusion of slide rule and four function calculators was the Faber Castell TR1, 2 and 3. The last gasp of possibly the finest slide rule manufacturer against the rising tide of the the pocket calculator. Towards the bottom of this page https://www.sliderulemuseum.com/Faber.htm .
For decades prior to that they produced a selected number of slide rules with an "Addiator" on the reverse side. That was a mechanical add/subtract machine, very thin, that could be operated with a little stylus that came with the slide rule. Again shown in the above slide rule site.
Craig
