On Saturday, 12 January 2019 23:52:43 UTC, Steve Walker wrote:
One of our old physics books (published by Mills & Boon oddly enough)
mentioned a process that used a measurement of a foot-pound per
pennyweight fortnight!

Page 133 onwards of this gives tables of so many obscure measurements my head hurts, and it's intended to be *helpful*

https://books.google.co.uk/books?id=..._toc_r&ca d=4

Owain