Does anybody know what this is?

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Originally Posted by Novasport

Looks like some kind of conversion chart poss to work out a radius. Emailed it me dad, he'll prob know what it is.

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cheers :)

it's called a slide rule, most likely to have beloged to an engineer at rolls royce.

Its to show how far you can go to a gallon in a R/R lol.

Its a slide rule to work out the area in a circle apparently

the pocket scientific calculator rendered it obsolete.