I would just like to say

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Where do the batteries go in this calculator ?
 

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boguing said:
No idea what happened to my British Thornton on, but I do have my father's one, and it's quite nice knowing that it designed bits of jet engines.
Click to expand...
My first pocket calculator was a Sinclair something or other, it wasn't much better than a slide rule as it was so primitive I had to keep a mental note of where the decimal point was. I think it operated on a Polish Notation system. Sinclair went on to invent the Sinclair C5, another not very successful venture.
 
Wimblowdriver said:
My first pocket calculator was a Sinclair something or other, it wasn't much better than a slide rule as it was so primitive I had to keep a mental note of where the decimal point was. I think it operated on a Polish Notation system. Sinclair went on to invent the Sinclair C5, another not very successful venture.
Click to expand...
And the the screen had red numbers and 2 AAA batteries to power it
 
Wimblowdriver said:
My first pocket calculator was a Sinclair something or other, it wasn't much better than a slide rule as it was so primitive I had to keep a mental note of where the decimal point was. I think it operated on a Polish Notation system. Sinclair went on to invent the Sinclair C5, another not very successful venture.
Click to expand...
Mine was a Casio. Seem to remember that bizarrely it didn't have an = button to click on so you had to click on + or something to see the answer to your calcualtion.
 
... that I spent several hours in the garage over a hot lathe making stuff. It's just as well because it was freezing cold out there.

All the "custom parts" for pedal-car 2WD units are done. :D
The lathe has started "shrieking" again :( and I measured the temperature at all the drivetrain bearings and they were all about the same (39°C). I cannot actually hear which one/set is complaining, I tried listening with a long screwdriver pressed to each but the noise is everywhere drowned by the belt-noise and none stand out. I put more oil in every button oiler and dashpot (not empty anyway) but it still shrieks.

Maybe the machine oil just isn't getting past some corrosion or build-up (the machine did stand idle for 40 years) and some penetrating oil is required.
 
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