‘15 ounces of Troy weight should by the statute make 1 pound of
haverdepoise, but the same pound weyeth commonly but 14 ounces 1/2 Troy,
14 ounces 3/5 at the uttermost.’
(14-1/2 oz. troy = 6960 grs.; 14-3/5 oz. = 7008 grs.)
But he unfortunately went on to say that ‘of things liquid and dry 1
pound of Troy weight maketh a pinte in measure,’ not seeing that 12 oz.
troy = only 13·16 oz. averdepois, while a wine-pint contained 16-2/3
ounces of water, and a corn-pint close on 16 ounces of wheat or 20 of
water.
But the ignorance and superstition engendered by troy weight was just as
bad in 1702 as in 1600 or even in 1500, as shown by the following
utterance of an eighteenth-century scientist:
Troy weight, whereby bread, gold, silver, apothecaries’ wares
etc. are weighed containing only 12 ounces in the pound, each
ounce 20 pennyweight each pennyweight 24 grams. This seems to
have been the most ancient weight by its name, as derived from
the famous city of Troy, from whence Brutus and his people are
said to have descended and to have called London Troy-Novant or
New Troy.
So said J. Ralphson, F.R.S., in his ‘Mathematical Dictionary’ (London,
1702). And then he continued:
The second and more common weight is called Avoirdupois, being
fuller and larger weight than the other, for it contains 16
ounces or 128 drams, viz. 384 scruples, viz. 7680 grains, by
this are weighed all kinds of grocery ware and base metals, as
iron, copper and brass, as also hemp, flax, rosin, pitch, tar
&c.
A century later we find not much improvement in the idea of the pounds
Troy and Averdepois.
‘The pound or 7680 grains avoirdupois equals 7000 grains troy and hence
1 grain troy equals 1·097 avoirdupois’ (Rees’ ‘Encyclopædia,’ 1819).
This is an example of the utter muddle the Troy pound had made in the
minds of otherwise intelligent people.
Similar pedantic efforts were continued, well into the nineteenth
century, to represent the Troy pound as the sole standard of England and
the averdepois pound only respectable as an offshoot of the royal pound
used for vulgar purposes.
_The Assize of Bread_
Such fictions were helped by the old statutes which compelled the sale,
first by Tower and then by Troy weight, of bread as well as of gold,
silver, and medicines. And confusion was made worse by the use for a
long period of a third weight for bread, the Amsterdam or Scotch troy
pound.
The peck loaf, supposed to be that produced from a peck of flour (16
pints), was to weigh 16 of these pounds = 17 lbs. 6 oz. averdepois, the
quartern loaf 4 = 4 lb. 5 oz., and the pint loaf (to be sold at a penny
when wheat was 4_s._ a bushel or 32_s._ a quarter) was to weigh one
pound = 17 oz. 6 drams averdepois. The periodical Assize of Bread fixed
the price of the peck loaf.
Public-domain text, read in full here on John Shaqi.
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