The standards made by this jury were as unsatisfactory as their report.
Little could be expected from persons who could, with Edward III’s
standard weights before them, report that ‘the lb. weight of avoirdepoiz
weight dothe consiste of fiftene ounc troie.’ This was in accordance
with the old fiction that the averdepois pound must be a commercial
offshoot of the royal pound, that it was 15 ounces Tower = 6750 grains,
and afterwards in Tudor times 15 ounces Troy = 7200 grains, or even 16
ounces Troy = 7680 grains.
Elizabeth and her advisers were not deceived by this obsequious report,
so, the standards made being found very erroneous, in 1582 a second and
more intelligent jury of goldsmiths and merchants was appointed, and the
result of their work was the production of 57 sets of standard Troy and
averdepois weights, which were distributed to the Exchequer, to cities
and towns. Some of these averdepois weights are still extant and do not
now differ by more than one grain in each pound from Imperial standard.
The Proclamation for Weights of December 16, 1587, established
averdepois weight, and ordered that ‘no person shall use any Troy weight
but only for weighing of bread, gold, silver and electuaries and for no
other thing.’
It seems probable that, in the two centuries before Elizabeth, the
standard of the commercial pound had risen by about 8 grains. This may
have occurred when the Troy pound superseded the Tower pound. In the
adjustment, which I assume as probable, of the Troy and Averdepois
pounds so as to obtain a ratio of 5760 to 7000, the latter standard,
raising the ounce from 437 to 437-1/2 grains, and the pound by 8 grains,
may have been adopted so as to avoid or diminish the cutting down of the
new Troy pound.
Thus was established by Elizabeth the English standard of weight.
Excellent standards of capacity and of length were also made; and she
established our silver coinage on its present basis.
And yet, well into the nineteenth century, even into the twentieth, went
on the puzzledom of our weights and measures, left to arithmetic book
and almanack makers blinded by the glamour of the royal pound.
No official utterance came to clear the darkness, for it was not till
1855 that the pound, then established as an Imperial standard, was
really defined.
2. THE IMPERIAL POUND
It is the weight in vacuo of a certain piece of platinum kept in London.
It is divided into 16 ounces, approximately Roman ounces. The ounce may
be divided into 16 drams.
The pound is also divided into 7000 grains, the ounce being 437-1/2
grains.
Public-domain text, read in full here on John Shaqi.
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