Wow! This is a superb "graph" (I call it a chart) of the units of mass (commonly called "weight") used in England and the numerical relationships among them. So far as I can tell it's accurate; it jibes with the numbers and history that I know. For one, you can see where that figure of 5760 grains per Troy pound came from!
You will see on here 5 "pounds" listed and they all differ in size. A similar situation in France is what led them to chuck out the whole mess and to devise a "simple decimal system" that we now call the metric system.
http://en.wikipedia.org/wiki/File:English_mass_units_graph.svg -- James R. Frysinger 632 Stony Point Mountain Road Doyle, TN 38559-3030 (C) 931.212.0267 (H) 931.657.3107 (F) 931.657.3108
