Distance used to be expressed in terms of inches, feet, yards, but there were other measurements too - as a child I learnt about barleycorns, chains, furlongs, fathoms and rods and doubtless many more which I have forgotten. When I lived in Nigeria fabric was sold in fathoms and I still think of my feet as size 7, a size based on barleycorns.
Weights were another gem. In everyday usage we had ounces, pounds and stones but there were also such wonderful units as scruples, hundredweights and quarters. My Doctor now weighs me in kilos but I still think of my weight in terms of stones and pounds.
There is one very important exception to all this decimalisation - draught beer is still sold in pints.
And many Brits still think of things in feet, inches, pounds just as we have done for hundreds of years.
But I know of no-one who could tell me the weight of a scruple!
It's 1.296 grams, or 20 grains. (I had to check!) 3 scruples make one dram and eight drams make one ounce