I. The Story of Averdepois
The story of our Imperial system has hitherto been utterly obscure. The origin of our foot, our gallon, our pound, indeed of all our measures, was quite unknown. That of the pound, which gives the key to the whole system, had been obscured by statutes which ignored any but the royal pound used at the mints. Yet these statutes, often purposely obscure, can be made to show the hidden sources of our system.
Our pound, settled at its present Imperial standard in the time of Queen Elizabeth, was then found to have risen slightly since the time of Edward III. It was found to have increased by about 8 grains. The ounce, now = 437-1/2 grains, had been 437 grains, the same weight as the ounce of Egypto-Roman pound, the Roman libra.[[22]] There is every reason to believe that this Roman standard passed to Britain, and that the libra, raised to 16 ounces, became the commercial pound, afterwards known as Averdepois, and now the Imperial pound.
When the Romans took the Alexandrian talent as the standard of their new libra-system, they divided it into 125 libræ, which were 1500 ounces or double-shekels, each ounce = 437 grains.
When the Arab Caliphs conquered the southern and eastern Mediterranean countries, they found in Egypt the Egypto-Roman pound, 1/125 of the Alexandrian talent; they adopted it, and divided it for coin-weight purposes into 72 mithkals, just as the Roman Emperors had divided the old As pound into 72 aurei; so 6 mithkals = the libra-ounce of 437 grains, just as 6 aurei = the As-ounce of 420-2/3 grains. It is not improbable that the survival of the Roman commercial pound in Saxon England was strengthened by commercial and scientific relations with the Moors of Spain. King Offa of Mercia struck a gold coin with an Arabic inscription, dated 157 of the Hejira = A.D. 774.
However this may have been, there seems no doubt that the Roman pound, raised to 16 ounces, was the standard of England before as after the Norman conquest, and there is no evidence of it having ever been in abeyance. In early Plantagenet times there was a sexdecimal series of weights:
The Stone of 16 lb.
The Wey of 16 stone = 256 lb.
There was also the Hundredweight, of which 20 made a ton of 2000 lb.; and 20 weys made a Last of approximately 5120 lb. or 2-1/2 tons.
The pound was divided into 16 ounces, each = 437 grains, and the ounce into 16 drams or drops = 27·3 grains.
Both before and after the Conquest there was another pound used in the mints, like the As in Rome. It was of Tower, or Cologne-marc, standard. There were doubtless many local variations of commercial standard, especially in measures of capacity, and it was the necessity of checking these which made King John and his successors declare that ‘there should be one standard throughout our kingdom, whether in weights or in measures.’
But the king had a mint-pound of his own, and he had to reconcile the existence of the coinage-pound and of the commercial pound with the customary declaration of unity of weight made in each reign. The king’s councillors evaded the difficulty by pretending that the measures of capacity were based on the mint-pound and, in statutes where a commercial pound had to be mentioned, by pretending that this was equal to 25 shillings weight or 15 ounces of the mint-pound. This deception led to others, so that, to make out the meaning of a statute of weights and measures, one must be able to read between the lines, and to be prepared for misleading and contradictory statements. I will take as an instance, Act 51 Henry III (1267):
An English peny called a Sterling, round and without clipping, shall weigh 32 wheat corns in the midst of the ear; and 20 d. do make an Ounce, and 12 Ounces one Pound, and 8 Pounds do make a gallon of wine and 8 gallons of wine do make a London Bushel which is the eighth part of a Quarter.
This declaration may be thus interpreted:
In the Tower there is a standard pound. An English silver penny should weigh 1/240 of this pound and 1/20 of its ounce, and the penny-weight may be divided into 32 aces or little grains. But there is another old-established pound used for all goods but gold and silver, bread and drugs. Our regard for the unity of weight forbids us to describe this pound otherwise than by mentioning that a wine-gallon contains 8 of these pounds weight of wine or of water, that 8 larger gallons each containing 8 pounds, not of wine, but of wheat, make a Bushel; and that 8 of these bushels make a quarter of a Chaldron containing a ton or 2000 lb. of wheat.
That this is correct is easily proved.
The Bushel is 1/8 of the Quarter, which was the quarter of a chaldron, the measure of a ton of 20 true hundredweight. The quarter was 500 lb. of average wheat, and the bushel weighed 500/8 = 62-1/2 averdepois lb. of wheat or, in wheat-water ratio, 78 lb. of wine or of water, the specific gravity of which differs but little. But 8 × 8 Tower lb. of wine = (5400 grs. × 8 × 8)/7000 = 49·4 averdepois lb. or, to be quite accurate, 49·5 lb. of early Plantagenet averdepois weight, when the ounce was of Roman standard, 437 grains; how then could the bushel = 78 lb. of wine, be the measure of 49·5 lb. of wine?
That there were two different gallons, the one for wine, the other for corn, is shown in the Ordinance 31 Edw. III, where it is ordered that ‘8 lb. of wheat shall make a gallon.’ It is true that this is continued by ‘the lb. shall contain 20 s.’; but very soon after the ordinance states that, for everything except groceries, each lb. shall be of 25 s., and we know that the 25 s. was merely a subterfuge to show the averdepois pound as 15 ounces Tower, afterwards 15 ounces Troy, neither of which it ever was: we may therefore dismiss this statement, and recognise that the wine-gallon held approximately 8 averdepois lb. of wine, and that the corn gallon, about one-fourth larger, held 8 averdepois lb. of wheat.
Further evidence is to be found in 12 Henry VII (1496).
This statute, after the usual preamble about ‘one weight and one measure,’ orders:
That the measure of a Bushel contain 8 gallons of wheat, and that every Gallon contain 8 lb. of wheat of Troy weight, and every Pound contain 12 ounces of Troy weight, and every Ounce contain 20 sterlings and every Sterling be of the weight of 32 Corns of wheat that grew in the midst of the ear of wheat according to the old law of the land.
While the bushel is now described as containing 8 gallons of wheat and each gallon 8 pounds of wheat, the old fiction is kept up that these are royal pounds. Only these pounds are now Troy, of 5760 grains, instead of Tower, of 5400 grains; 64 Troy pounds were equal to 52-2/3 lb. averdepois, a weight still far from the 62-1/2 lb. averdepois of wheat contained in the extant bushel-measure of Henry VII. And though the mints were coining 420, instead of 240, pennies from the 5760 grain-pound of silver, so that these were little more than half the weight of Henry III’s pennies, yet they were still of the weight of 32 wheat-corns.
The substance of this statute was embodied in a State-document adorned with a picture of the King’s Steward presiding over the gauging of bushels and weighing of wheat-corns, surmounted by a picture of two entwined wheat-ears with the inscription:
The Conage of the Mynte.
The whete eare. Two graynes maketh the xvi pte. of a penny, ffower graynes maketh the viij pte. of a penny.
After this impudent assertion one is not surprised to read that it was ‘the same tyme ordeired that xvi uncs of Troie maketh the Haberty poie a pounde for to buy spice[[23]] by,’ nor by the statement that ‘the C is true at this daye, ffyve score for the hundred as appeareth in Magna Carta.’
Comment on these ingenious statements seems hardly necessary.
The only changes in English weights since the time of Henry III, or indeed much earlier times, have been:
1. The raising of the hundredweight to 112 lb.
2. The lowering of the stone from 16 lb. to 14 lb. to make it one-eighth of the new hundredweight.
3. The rise of the averdepois pound from 16 Roman ounces of 437 grains to 16 ounces of 437-1/2 grains; a difference of 8 grains, so as to make it 7000 grains of the Tudor Troy pound.
4. The re-legalising of the 100 lb. or cental weight in 1879.
I may observe that the octonary series of measures of capacity, also of the 14 lb. stone and new Cwt., is quite in harmony with the sexdecimal system, however objectionable be those units.
The Recognition of Averdepois Weight
It is not until 1485 (Ripon Ch. Acts, quoted in the ‘New English Dictionary’) that we find mention of averdepois, though there had been standard weights of it from temp. Edw. III, ‘per balance cum ponderibus de haberdepase,’ and those standards were extant in the time of Elizabeth.
The document embodying 12 Henry VII (1496) mentions, as has been seen, the Habertypoie pound, with the assertion that it was 16 Troy ounces, an assertion causing confusion for centuries afterwards.
In Arnold’s ‘Customs of London,’ c. 1500, there is mentioned ‘the Lyggynge Weyght, by which is boughte and solde all maner of marchaundise as tynne, ledde ... and al maner of specery ... and such other as is used to be solde by weyght; and of this weyght xvj uncis make a pound, and C and xij li. is an C, and x C make a M of all suche marchaundises ... except wulle.’
This ‘lying weight’ was by the balance, the weight lying in one scale, and not hanging or sliding on the beam of a stilyard as in Auncell weight. The stilyard, very portable, as not requiring heavy weights, yet admitted of fraud. Arnold says ‘this weight is forboden in England by statute of parlement, and also holy church hath cursed in England all that beyen or sellen by that auncel weyght.’
In 1532 it was ordered by 24 Henry VIII that meat ‘shall be sold by weight called Haver-du-pois,’ and in 1543 Recorde (‘Ground of Artes’) says, ‘But commenly there is used an other weyght called haberdyepoyse in which 16 onces make a pounde.’
In 1545 the Custom-House notified that ‘thys lyinge and Habardy peyse is all one.’
Having cleared away, as I hope, the obscurity which so long hung over the commercial weight ignored by the statutes, it may be well to mention that ‘Averdepois’ is the best spelling of this word, and is so accepted by the ‘New English Dictionary.’ ‘Aver’ is an old-established English word for ‘goods,’ and the earlier form ‘Haberdepase’ shows the original pronunciation. The spelling of the last syllable in ‘Averdepois’ is a sufficient concession to an incorrect modern custom.
The term originally applied to heavy goods, such as came from beyond sea; if the word was sometimes spelt, as in 25 Edw. III, ‘bledz, avoirdepois, chars, pessons’ (corn, heavy goods, meat, fish), it does not follow that the oi diphthong was pronounced as in ‘boy.’ The word pessons, now written poissons, shows the sound-value of the diphthong. The sound now given to it in modern French is a corruption. Up till 1700, even in Paris, oi was pronounced é or wé. ‘Averdepez’ is the true pronunciation. However, the influence of ‘poise’ prevents any improvement on the word being written and pronounced as ‘Averdepois.’
Though measures of capacity had always been on an averdepois basis, the admission of averdepois weight to statute recognition only dates from the time of Elizabeth. In her reign light begins to appear in our system of weights and measures. In 1574 she ordered a jury to examine the standard weights (many of Edward III and succeeding kings), to report on them, and to construct standards ‘as well of troy weight as of the avoirdupois.’
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.