Yes really, if your job requires lots of calculations you’d be stupid not to have one, even back when they were expensive.
Every machinist I know, even the crusty old ones, carry a calculator in their pocket. It’s indispensable. Why wouldn’t you carry one if you need it all the time?
If a person sees something they’ve never seen before, and turns around and flees, that’s a problem with them being sheltered and pathetic, not a problem with the new thing they haven’t encountered before.
If you go down deep enough the earth temperature is stable at 12 C. But I’m pretty sure that’s like thousands of feet down. Geothermal rigs drill 500+ meters (1600 feet) down. Having a hard time finding a source on the stable earth temp though.
I mentioned 6 feet because it’s well below the frost line where I am, but I guess in that part of Iran they probably don’t have to worry about that.
Mostly I was just wondering if you had found something on how deep those waterways were actually built.
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