chaldron

Sometimes called a chalder. When used for coal the chaldron was in some times and places a unit of mass and in others a unit of capacity.

1

In England, 15th – 19th century, a unit of dry capacity used for grain, = 4 quarters = 32 bushels.

2

In England, 15th – 19th century, a unit of dry capacity used for coal. The custom's Book of Rates of 1660 speaks of three chalders:

Sea Coles the Chalder New Castle measure exported by English in English built Bottomes
Sea Coles the Chalder London measure exported by English in English built Bottoms
Sea Coles of Wales or the West countrey which shall be transported into Ireland the Isle of Mann or Scotland to pay xij d. the Chalder water measure

The distinction between the London and Newcastle chaldron appears at least as early as 1580. Hayes (1740, page 206) states that “8 Chaldron at Newcastle makes at London about 15 Chaldrons.”

Coal was taxed by the chaldron, not by weight, so it was to the seller's advantage to make the chaldron as large as possible.

The Newcastle chaldron

The Newcastle chaldron, used only for coal. Before 1695 its weight was taken to be 42 hundredweight (about 2134 kg). In 1695 it was standardized at = 72 heaped bushels¹. One chaldron was enough to fill three wains (wagons), in which case it was reckoned as 52½ hundredweights (5880 pounds, about 2667 kilograms).

1. 6 & 7 William III chapter 10 1695.

Simmonds (1892), page 81.

The London chaldron

By a law of 1665, 1 chaldron = 36 bushels, weighing 25 1/3 hundredweights, about 2837 pounds avoirdupois (about 1287 kilograms).

All sorts of coale commonly called sea-coals brought into the River Thames and sold, shall be sold by the chaldron containing thirty-six bushels heaped up according to the bushel sealed for that purpose in the Guildhall.

16 & 17 Charles II chapter 2, 1664-1665.

The water measure chaldron

On shipboard 1 score of chaldrons was not 20, but 21 chaldrons.

At Newcastle, if the coal was loaded on shipboard the chaldron was reckoned at 53 hundredweights (5936 pounds, about 2692.5 kilograms).

The chalderne of sea cooles is 12 sackes of sea coole, euery sacke ought to conteyne 4 bushells watter measurs, the bushel hepid as much as yt will stand, so that the chalderne is 48 bushells in grosse. With euery 20 chalderne theris one chalderne alowance to the byer.

Geometry upon Waights and Measures calid the Art Statike.
MS Reg. 18 C. XX 1590-1620.¹

The Weights and Measures Act of 1835² required all coal to be sold by weight, not by measure, an injunction repeated in the Weights and Measures Act of 1878³, which nonetheless again defined the chaldron at 36 bushels.

The chaldron was abolished by the Weights and Measures Act of 1963.⁴

1. Hall and Nicholas, 1929, page 24.
2. 5 & 6 William IV chapter 63 sec 9. A Collection of the Public General Statutes, passed in the Fifth and Sixth Year of the Reign of His Majesty King William the Fourth. London: Eyre and Spottiswoode, 1835. Page 288.
3. 41 & 42 Victoria chapter 49 section 6, 1878. Public General Statutes Volume 13, pages 308-341.
4. Elizabeth II chapter 31 1963. London: Her Majesty's Stationery Office, 1964.

3

In Atlantic ports during the age of steamships the chaldron of coal had various magnitudes. Picton, Nova Scotia, 3456 pounds; New York City, 2500 pounds; United States generally, 2940 pounds.

Simmonds (1892), page 81.

4

A unit, probably of mass, used at least in customs for stones used to line drainage ditches. We do not know its magnitude or whether it is equivalent to one of the chaldrons for coal.

Grindle stones the chaldron

“A Subsidy granted to the King of Tonnage and Poundage and other summes of Money payable upon Merchandize Exported and Imported.”
A statute from the 12th year of Charles II, 1660. The selection is from the Booke of Rates, which is not part of the statute proper but developed from it. Both are printed in:
Statutes of the Realm, Volume 5: 1628-80, John Raithby, editor.
London: 1819.