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The 4-bushel bag was the standard international shipping unit for grain, [1] [2] [3] and the coomb was in common use in farming in Norfolk and Suffolk until well after the end of World War II, in fact for as long as grain was handled in sacks, a practice which ended with the introduction of combine harvesters which had bulk grain tanks.
This quarter was a unit of 8 bushels of 8 gallons each, understood at the time as a measure of both weight and volume: the grain gallon or half-peck was composed of 76,800 grains weight; the ale gallon was composed of the ale filling an equivalent container; and the wine gallon was composed of the wine weighing an equivalent amount to a full ...
Bushels are now most often used as units of mass or weight rather than of volume. The bushels in which grains are bought and sold on commodity markets or at local grain elevators, and for reports of grain production, are all units of weight. [7] This is done by assigning a standard weight to each commodity that is to be measured in bushels.
The units by which the yield of a crop is usually measured today are kilograms per hectare or bushels per acre. Long-term cereal yields in the United Kingdom were some 500 kg/ha in medieval times, jumping to 2000 kg/ha in the Industrial Revolution, and jumping again to 8000 kg/ha in the Green Revolution. [1]
When grain is harvested from a farm with a Combine harvester the combine typically loads the grain into a grain cart, which then unloads it into a grain hopper trailer, gravity wagon, or dump truck to be hauled to the local grain bin. The commercial grain bin operator then sells the commodity at an opportune time and it is then transported ...
In granulometry, the particle-size distribution (PSD) of a powder, or granular material, or particles dispersed in fluid, is a list of values or a mathematical function that defines the relative amount, typically by mass, of particles present according to size. [1]
Grain cart to grain hopper trailer Corn combine harvester unloading into grain cart Two combines unloading into 2 chaser bins. A chaser bin, also called grain cart, bank out wagon or (grain) auger wagon, is a trailer towed by a tractor with a built-in auger conveyor system, usually with a large capacity (from several hundred to over 1000 bushels; around 15 tonnes (33,000 lb) is average).
Currently, there are three main empirical models which are used to calculate the grinding work required relative to grain size and quantity. The Kick model may be utilized for grains with diameters greater than 50 mm; the Bond model for grain diameter between 0.05 mm – 50 mm; the Von Rittinger model for grain less than 0.05 mm.
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