[steeljack]

bit of a wander , but I do think the older generation brought up before decimalization had a better grasp of basic math and mental arithmatic . One only needs to look at all the different systems we had to learn ........ and how many of each made up the other
measurement....inch, feet, yards, furlongs, miles
weight ........... ounces, pounds, stones,cwts , tons
money............1/2d,1d,3d,6d,shillings, two bobs, half-crowns, and £s

and I defy anyone to tell me how the "whitworth" system for nuts and bolts was arrived at