from The Century Dictionary and Cyclopedia
- n. A duty on salt; in London, a duty, the twentieth part, formerly payable to the lord mayor, etc., for salt brought to the port of London.
Sorry, no etymologies found.
Thus the income-tax was raised to six and a quarter per cent., and the salt-duty was augmented by one-half.
In 1730 Gideon (or Gidjun) was appointed supervisor of the salt-duty at Alloa, the leading customs port at the head of the Firth of Forth, and there remained until 1734, when he removed to a similar post at Prestonpans, a smaller town below Leith.