Cumsalisgrano • Link
Chaldron see more pics of Railway [railroad] version of taking coals to London
Michael Robinson • Link
From the Latin caldaria, a caldron, M.F. chaldere, a kettle or pot, M.E. chalder, chaldre. Originally pronounced chalder, later chaldron, although in some areas the older pronunciation was still used in the 19th century.
A measure of capacity for coal, coke and grain which was used in England, Scotland and Wales. In use before the 15th century the standard chaldron of coal was first regulated in 1421 under Henry V, at 32 'bushels', totalling 1 'ton' of 2000lb (907·180kg) and was equal to one twentieth of a 'keel' or 'barge load' of 20 tons ( ). This applied every where except Newcastle upon Tyne, where the chaldron totalled 42 cwt and equalled 1/8 of a 'keel'. Taxes of 2d (1p) per chaldron were calculated as it was loaded aboard ship. By the late 18th century, to avoid tax revenues, the size of the regular chaldron had increased by 240 Lbs. ( ). and the Newcastle chaldron by 1232 Lbs. ( ).
1590 A chaldron of sea coals was 12 'sacks' each containing 4 heaped 'bushels'.
1615. A measure of 32 bushels; when used for coal it was 36 bushels. 138.
1635 Shields, Scotland the chaldron consisted of three 'wain' load and cost 7s. (35p). 122
1676-77 the chaldron was increased to 36 heaped 'bushels' totalling 1 ton ( ) of 2240lb (1016·040kg) or 20 cwt ( ) of 120lb each. The Newcastle chaldron, was a measure containing 53 cwt of coal. The size of a 'chaldron wagon' was (Custom House measurement) was 217·989 cubic ft. and the size of a 'boll', being 976·989 cubic ins. Therefore the chaldron was equal to 22·526 'bolls'. The weight of the 'boll' of coals was 2·35284 cwt ( ). The London chaldron consisted of 36 'bushels' heaped up, each 'bushel' to contain a 'Winchester bushel'. One 'quart' was to be 19½ ins. in diameter externally. It was found by repeated trials that 15 'London Pool Chaldrons' were equal to 8 'Newcastle chaldrons', (Rees's Cyclopedia). Therefore the 'London chaldron' must have equalled 28·266 cwt ( ). Various other estimates were also stated for the 'London chaldron'.
1708 the chaldron contained 36 'bushels'.
1789 Beaument's Treatise on the Coal Trade, 28·266 cwt ( ).
1793 Dr. MacNab, Letters to Pitt. 27·000 cwt ( ).
1829 W. Dickson, Evidence on the Coal Trade. 26·500 cwt ( ).
1847 B. Thompson, Inventions and Improvements 28·462 cwt ( )
"Numerous measurement units were used by the London trade Coal was loaded in the north using the Newcastle chaldron (NCh) - a weight measure, whereas it was unloaded in London using a volumetric measure - the London chaldron (LCh). The LCh was defined as 36 coal bushels, but there was no consensus on exactly how much quantity was contained in this measure. Modern and contemporary estimates have ranged from 288 to 396 gallons, or from 25.7 cwt to 28.5 cwt when measured by weight."
Aashish Velkar, 'Market Transparency, Uniform Measurements and Standardized Quantities: Institutional Change in 19th Century Britain'
Cumsalisgrano • Link
The above and the Two URL's below indicate the " why there was great need" for Standards and means and 'weigh[t]s' to enforce them.
The price of a lump of cole be what the customer would put up with and was able to pay .
Caveat emptor at work.
Another factor at work was that coles would have none stardard specific gravities as qualities be very un even.
Chart showing the number of references in each month of the diary’s entries.