>>>I'd forgotten that 28 lbs also make a quarter (qr) and 4 qr = 1 hundredweight (cwt), 20 cwt = 1 ton (not a metric tonne). Small workers' vans over here are rated by their weight in cwt.
>>
>>Think of lengths: poles and furlong (furrow-long, i.e. the length of ploughed furrow)
>>
>>In "troy weight" there are 20 grains to a scruple (cf your "sand")
>>:-)
>
>
>Stop. You are giving me a headache.

Well you're the guys who are still keeping these stupid units alive: carpenters measuring things in feet and inches, for example, and I think Harleys have their engine capacity stamped on in cu ins, nicht war?