A tonne is a megagram that is one thousand kilograms. It also known as a metric ton. A ton is either 2240 or 2000 pounds ( 1,016.0469088 or 907.18474 kg) depending on whether you prefer the long or short flavour.

A barleycorn is a third of a inch (this relates to an old definition of the inch).

A scruple is an apothecary unit of mass equal to 20 grains. Note the apothecary grain is the same as the avoirdupois grain and it takes seven thousand of them to make an avoirdupois pound.

The bovate is the amount of land an ox can plough in a year.

The hogshead is the volume of a large cask for wine or beer. Down through the centuries the size seems to have depended on where and what you're measuring ... and as far as I can tell it still does though to a lesser extent.

If it's beer then a hogshead is equal to a barrel and a half or three kilderkins and there are two firkins to the kilderkin. Now in the old days a firkin was sometimes eight, nine and even eight and a half gallons. Of course there have been a number of different gallons too. An imperial beer firkin is nine imperial gallons making an imperial hogshead of beer about 245.49 litres. I don't know whether there is a US beer hogshead.

Then there is the wine hogshead. It once depended not only on where you measure your wine but on what kind of wine you were measuring. Now an imperial hogshead of wine is 70 gallons or about 238.7 litres US wine hogshead is 63 US gallons or about 238.48 litres.

No wonder the metric system was so quick to be adopted around the world.

A barleycorn is a third of a inch (this relates to an old definition of the inch).

A scruple is an apothecary unit of mass equal to 20 grains. Note the apothecary grain is the same as the avoirdupois grain and it takes seven thousand of them to make an avoirdupois pound.

The bovate is the amount of land an ox can plough in a year.

The hogshead is the volume of a large cask for wine or beer. Down through the centuries the size seems to have depended on where and what you're measuring ... and as far as I can tell it still does though to a lesser extent.

If it's beer then a hogshead is equal to a barrel and a half or three kilderkins and there are two firkins to the kilderkin. Now in the old days a firkin was sometimes eight, nine and even eight and a half gallons. Of course there have been a number of different gallons too. An imperial beer firkin is nine imperial gallons making an imperial hogshead of beer about 245.49 litres. I don't know whether there is a US beer hogshead.

Then there is the wine hogshead. It once depended not only on where you measure your wine but on what kind of wine you were measuring. Now an imperial hogshead of wine is 70 gallons or about 238.7 litres US wine hogshead is 63 US gallons or about 238.48 litres.

No wonder the metric system was so quick to be adopted around the world.