Apparently Troy pounds are out (at least for precious metals) but Troy
grains, pennyweights, and ounces are in.
The following is from NCWM Handbook 130 (2006):
2.17. Precious Metals
2.17.1. Definition
2.17.1.1. Precious metals. - Gold, silver, platinum, or any item
composed partly or completely of these metals or their alloys and in
which the market value of the metal in the item is principally the gold,
silver, or platinum component.
2.17.2. Quantity. - The unit of measure and the method of sale of
precious metals, if the price is based in part or wholly on a weight
determination, shall be either troy weight or SI units. When the
measurement or method of sale is expressed in SI units of mass, a
conversion chart to troy units shall be prominently displayed so as to
facilitate price comparison. The conversion chart shall also display a
table of troy weights indicating grains, pennyweights, and troy ounces.
(Added 1982)
http://ts.nist.gov/WeightsAndMeasures/upload/11_IV_MethodReg-06-H130-FINAL.pdf
Jim
James R. Frysinger wrote:
Troy pounds and Troy ounces have long been and I believe still are used
in the U.S. trading in precious metals. I believe that (Troy)
pennyweights fall into that category, too.
Jim
John M. Steele wrote:
Maybe, superb chart of units of mess? :)
If I look at how they handled the various pounds, the av. lb and stone
lead to different quarters, hundredweights and tons, which should be
set up as separate ellipses, particularly since the long and short ton
and its subdivisions are a modern "two peoples divided by a common
language" issue.
As far as I know the troy pound (and all the others except av. pound)
is not legal for trade in the US or UK, and has no real relevance.
However, the troy ounce continues for precious metals.
--- On *Wed, 8/5/09, James R. Frysinger /<[email protected]>/*
wrote:
From: James R. Frysinger <[email protected]>
Subject: [USMA:45511] Neat chart of English mass units
To: "U.S. Metric Association" <[email protected]>
Date: Wednesday, August 5, 2009, 11:45 AM
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
--
James R. Frysinger
632 Stony Point Mountain Road
Doyle, TN 38559-3030
(C) 931.212.0267
(H) 931.657.3107
(F) 931.657.3108
