Kilopascal asked in USMA 18462:
>I think people reading the article about the Lira being equal to the pound
>would immediately associate that pound with the UK/US pound of today. As
>part of our promotion of SI, bringing up the history of the old units and
>how they varied helps make the old units look foolish.
>
>What is the value of the gros and was the grain used in France the same
>grain used in the US?
>
>John
Fran�ois Cardarelli in "Scientific Unit Conversion". Springer, 1966 gives
1 grain avoirdupois & apothecary = 64.80 ug
1 grain de Paris = 53.11 mg
1 grain (jewellers') = 50 mg
1 gros de Paris (drachm) = 72 grains = 3.824 g
1 once de Paris = 8 gros = 30.59 g
in Paris and Bayonne, 1 livre = 9216 grains = 489,5 g
in other parts of France 1 livre = from 6479 to 9593 grains (but
what grains?)
Joseph B.Reid
17 Glebe Road West
Toronto M5P 1C8 TEL. 416-486-6071
