Does anybody know what this is?

[NovaBoi92]

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

cheers

[SharonSR]

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

[Ernie]

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

[Novasport]

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

[mowgli]

the pocket scientific calculator rendered it obsolete.