Maths and engineering slide rule with an unusually wide range of scales, including natural logarithms, multiples and reciprocals with pi, squares cubes trig functions, and the root of (1-x)² which is not often found on a slide rule.
I have photographed the markings close up to show them, it's also shown up some dust that is not a permanent fixture, it wiped off.
Interesting rule for a collector.
190g UK post £3.80 EU / World 1 / World 2 (AU) / World 3 (USA) post £11.30 / £15.50 / £17.30 / £16.20
Buyer welcome
collection from central Bristol, easy to park and outside CAZ.
Dispatch time stated 3 working days to allow grouping orders for posting, will often be sooner than that.