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I'm no boffin ES. The last time I used my bamboo Faber=Castell slide rule, I got a blood blister off that plastic sliding thing on it and it made me swear. That's why it's called a cursor. I just thought that you chaps may have come upon such calculations whilst towing things around the world.
I do like that catenary word though - it's applicable to the Chain Bridge over the River Tweed.
And RT - I'm glad I hid the shotgun ...
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